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https://issues.apache.org/jira/browse/TINKERPOP-2377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17130546#comment-17130546
 ] 

Stephen Mallette commented on TINKERPOP-2377:
---------------------------------------------

Here is an example of a full log with these failures - I just had the same 
build fail twice in a row with this:

https://gist.github.com/spmallette/48a725498809fab4c0141cc73c3613e7

> Investigate intermittent .NET GLV test failures 
> ------------------------------------------------
>
>                 Key: TINKERPOP-2377
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2377
>             Project: TinkerPop
>          Issue Type: Improvement
>          Components: dotnet
>    Affects Versions: 3.4.6
>            Reporter: Stephen Mallette
>            Priority: Minor
>
> Travis builds of .NET seem instable. Some of that instability is out of our 
> control and bound to the travis environment but I've noticed at least one odd 
> pattern of failure around these tests:
> {code}
> Failures and skipped scenarios:
> 1) g_V_constantXnullX: Failed
> System.Reflection.TargetInvocationException: Exception has been thrown by the 
> target of an invocation.
>  ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversal`2.Constant[E2](E2 e) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversal.cs:line
>  428
>    --- End of inner exception stack trace ---
>    at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] 
> arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags 
> invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 2) g_V_outE_propertyXweight_nullX: Failed
> System.Reflection.TargetInvocationException: Exception has been thrown by the 
> target of an invocation.
>  ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversal`2.Property(Object key, 
> Object value, Object[] keyValues) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversal.cs:line
>  1265
>    --- End of inner exception stack trace ---
>    at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] 
> arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags 
> invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 3) g_V_mapXconstantXnullXX: Failed
> System.Reflection.TargetInvocationException: Exception has been thrown by the 
> target of an invocation.
>  ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversal`2.Constant[E2](E2 e) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversal.cs:line
>  428
>    at Gremlin.Net.Process.Traversal.__.Constant[E2](E2 a) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/__.cs:line
>  278
>    --- End of inner exception stack trace ---
>    at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] 
> arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags 
> invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.StaticTraversalParameter.GetValue()
>  in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/StaticTraversalParameter.cs:line
>  64
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.BuildParameters(MethodInfo
>  method, Token token, IDictionary`2& genericParameterTypes) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  247
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 4) g_V_hasLabelXpersonX_propertyXname_nullX: Failed
> System.Reflection.TargetInvocationException: Exception has been thrown by the 
> target of an invocation.
>  ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversal`2.Property(Object key, 
> Object value, Object[] keyValues) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversal.cs:line
>  1265
>    --- End of inner exception stack trace ---
>    at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] 
> arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags 
> invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 5) g_addVXnullX_propertyXid_nullX: Failed
> System.Reflection.TargetInvocationException: Exception has been thrown by the 
> target of an invocation.
>  ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversalSource.AddV(ITraversal 
> vertexLabelTraversal) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversalSource.cs:line
>  337
>    --- End of inner exception stack trace ---
>    at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] 
> arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags 
> invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 6) g_V_group_byXageX: Scenario ignored
> 7) g_injectXnull_1_3_nullX: Failed
> System.Reflection.TargetInvocationException: Exception has been thrown by the 
> target of an invocation.
>  ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversalSource.Inject[S](S[] 
> starts) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversalSource.cs:line
>  350
>    --- End of inner exception stack trace ---
>    at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] 
> arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags 
> invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversalFromTokens(IList`1
>  tokens, GraphTraversalSource g, IDictionary`2 contextParameterValues, String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  78
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 8) 
> g_injectX10_20_null_20_10_10X_groupCountXxX_dedup_asXyX_projectXa_bX_by_byXselectXxX_selectXselectXyXXX:
>  Failed
> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversalSource.Inject[S](S[] 
> starts) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversalSource.cs:line
>  350
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.<>c.<.cctor>b__23_1(GraphTraversalSource
>  g) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  41
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> 9) g_injectXname_marko_age_nullX_selectXname_ageX: Failed
> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
>    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
>    at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& 
> value)
>    at Gremlin.Net.Process.Traversal.Bindings.GetBoundVariable[TV](TV value) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bindings.cs:line
>  66
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  113
>    at Gremlin.Net.Process.Traversal.Bytecode.ConvertArgument(Object argument, 
> Boolean searchBindings) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  128
>    at Gremlin.Net.Process.Traversal.Bytecode.FlattenArguments(Object[] 
> arguments) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  105
>    at Gremlin.Net.Process.Traversal.Bytecode.AddStep(String stepName, 
> Object[] args) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/Bytecode.cs:line
>  88
>    at Gremlin.Net.Process.Traversal.GraphTraversalSource.Inject[S](S[] 
> starts) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/src/Gremlin.Net/Process/Traversal/GraphTraversalSource.cs:line
>  350
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.<>c.<.cctor>b__23_2(GraphTraversalSource
>  g) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  42
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.TraversalEvaluation.TraversalParser.GetTraversal(String
>  traversalText, GraphTraversalSource g, IDictionary`2 contextParameterValues) 
> in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/TraversalEvaluation/TraversalParser.cs:line
>  69
>    at 
> Gremlin.Net.IntegrationTest.Gherkin.CommonSteps.TranslateTraversal(String 
> traversalText) in 
> /home/travis/build/apache/tinkerpop/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/CommonSteps.cs:line
>  108
> {code}
> I'm not sure if anything can be discerned from these stracktraces, but, if 
> not, the next time they fail in this way I will be sure to grab the entire 
> travis output.



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