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Dev build, Mustang. Ran process (NB IDE) in debugger and stopped at a breakpoint. Started using "Pop Stack" context menu item going further up the stack to find why a method had been called. At each point, used tooltip in editor to evaluate local vars. Worked a couple of times, and then trying to get the context menu in the Call Stack tree just threw this exception and I had to stop.
Created attachment 26432 [details] Stack trace
This is fixed now - after issue #67886 was fixed.
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.