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[200509041800] I don't know how to reproduce this issue. I was playing with add/remove module from module suite. The exception was thrown on pupup on two module projects.
Created attachment 24496 [details] exception
This should fix the symptom anyway: committed Up-To-Date 1.9 apisupport/project/src/org/netbeans/modules/apisupport/project/ui/ModuleActions.java
cannot reproduce