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https://issues.apache.org/jira/browse/FLINK-5713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924330#comment-15924330
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ASF GitHub Bot commented on FLINK-5713:
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Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3535
R: @kl0u for review
> Protect against NPE in WindowOperator window cleanup
> ----------------------------------------------------
>
> Key: FLINK-5713
> URL: https://issues.apache.org/jira/browse/FLINK-5713
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Fix For: 1.2.1
>
>
> Some (misbehaved) WindowAssigners can cause windows to be dropped from the
> merging window set while a cleanup timer is still active. This will trigger a
> NullPointerException when that timer fires.
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