This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
Presuambly RANDOM. Attaching stacktrace.
Created attachment 28614 [details] 71914-AE.txt
The root and solution of this issue is described in issue 68285.
Didn't occur for a long time => closing as non-reproducible.