massakam commented on pull request #182:
URL: 
https://github.com/apache/pulsar-client-node/pull/182#issuecomment-986434813


   @rickyes This phenomenon does not always occur. It happens when 
`data->consumer` is accessed in the following part before it is initialized.
   
https://github.com/apache/pulsar-client-node/blob/50c090678ecedaa06e2c68ce1db3046655a9a075/src/Consumer.cc#L62-L65
   
   Adding sleep to the following part will almost certainly reproduce this 
issue.
   ```diff
   --- a/src/Consumer.cc
   +++ b/src/Consumer.cc
   @@ -23,6 +23,7 @@
    #include "MessageId.h"
    #include <pulsar/c/result.h>
    #include <atomic>
   +#include <chrono>
    #include <thread>
   
    Napi::FunctionReference Consumer::constructor;
   @@ -163,6 +164,7 @@ class ConsumerNewInstanceWorker : public 
Napi::AsyncWorker {
        Consumer *consumer = Consumer::Unwrap(obj);
   
        consumer->SetCConsumer(this->consumerWrapper);
   +    std::this_thread::sleep_for(std::chrono::seconds(5));
        consumer->SetListenerCallback(this->listener);
        this->deferred.Resolve(obj);
      }
   ```


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