Error Adding Participants to Migrated Process Instances After Update

Camunda 7 Topics
1

We recently upgraded our Camunda Spring Boot application to a new version and migrated existing process instances (formations) to the updated process definition. Before the migration, we could add new participants to running instances without issues. However, for the migrated instances, attempting to add participants results in the following error:

csharp

CopierModifier

***2025-01-20 11:59:01.089 WARN 13408 --- [nio-8443-exec-8] org.camunda.bpm.engine.rest.exception    : ENGINE-REST-HTTP500 java.lang.IllegalArgumentException: UTILS-02001 Parameter 'parameter' is null***

The error suggests that a required parameter is null, but this functionality works correctly for new instances started after the update.

What could be causing this issue with the migrated instances, and how can I resolve it to ensure participants can be added successfully?

Any guidance or troubleshooting steps would be greatly appreciated.

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