kennknowles commented on PR #26422:
URL: https://github.com/apache/beam/pull/26422#issuecomment-1523815996

   This is undoubtedly something I added because the thing looked like it was 
required to be non-null.
   
   ```
   Caused by: java.lang.IllegalStateException
        at 
org.apache.beam.sdk.util.Preconditions.checkStateNotNull(Preconditions.java:452)
   ```


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