CalvinConfluent opened a new pull request, #18958:
URL: https://github.com/apache/kafka/pull/18958

   Fix a null ptr problem when upgrading ELR. It does not affect the UTs 
because the update is actually successful but it confuses the admin client.
   ```
   Could not upgrade eligible.leader.replicas.version to 1. The server 
experienced an unexpected error when processing the request.
   ```
   
   The nullptr error happens here. 
https://github.com/apache/kafka/blob/trunk/metadata/src/main/java/org/apache/kafka/controller/QuorumController.java#L2086
   


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