Github user nvazquez commented on the issue:
https://github.com/apache/cloudstack/pull/1677
@jburwell actually with this small changes vm snapshots can be taken, I
already tested manually and succeeds. This problem was related to Vmware API,
which sends a task with null name within 12 minutes after vm starts in its
recent tasks and if not checked, when iterating through this tasks,
NullPointerException caused the whole procedure to fail
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