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I tried to create a JFrame (New From Template -> Swing Forms -> JFrame). I didn't put some component to the form editor. When I moved a mouse on the Form[Name] editor and pushed a right mouse's button then exception was thrown.
Created attachment 11 [details] Exception.txt
*** This bug has been marked as a duplicate of 6740 ***
Bug assigned to the module owner.
Resolved for 3.3.x or earlier, no new info since then -> closing.