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https://issues.apache.org/jira/browse/FLINK-6182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15940174#comment-15940174
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ASF GitHub Bot commented on FLINK-6182:
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Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/3606
+1 to merge
> Fix possible NPE in SourceStreamTask
> ------------------------------------
>
> Key: FLINK-6182
> URL: https://issues.apache.org/jira/browse/FLINK-6182
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime
> Reporter: Ufuk Celebi
> Priority: Minor
>
> If SourceStreamTask is cancelled before being invoked, `headOperator` is not
> set yet, which leads to an NPE. This is not critical but leads to noisy logs.
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