DominicWuest opened a new issue, #882:
URL: https://github.com/apache/age/issues/882

   When running the following query:
   ```cypher
   MERGE () MERGE n0 = ()
   ```
   
   I encountered the following error:
   ```
   pq: argument 1 must not be null
   ```
   
   I believe the query mentioned above is semantically and syntactically 
correct and thus no error should be thrown here.
   Additionally, the query runs successfully in neo4j.
   
   I encountered this issue when testing queries against the 
**apache/age:PG13_latest** docker image.
   
   ### Steps to reproduce
   Run the following query and observe it throws an error:
   ```cypher
   MERGE () MERGE n0 = ()
   ```
   
   ### Expected behavior
   The query should run successfully
   
   ### Actual behavior
   The query fails with the error message `argument 1 must not be null`.


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