Github user iweiss commented on the pull request:
https://github.com/apache/activemq-artemis/pull/485#issuecomment-214328134
@mtaylor Not really. When there is an increase in load on a clustered
Artemis solution, sometimes `removeReferenceByID()` is called when there are no
more message references to be delivered, throwing an NPE instead.
The idea of the fix is to check for the size of `deliveringRefs` before
doing any further process.
Makes sense?
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