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I had several editor windows open. I closed them all via Right Click -> Close All Editor windows. A second or so after they all disappeared (I may have tried to activate a project context menu in this time period, can't recall for certain), the attached exception popped up. Here's an excerpt: java.lang.ArrayIndexOutOfBoundsException: 1 at org.openide.util.lookup.ProxyLookup$R.lookupChange(ProxyLookup.java:416) at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:189) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction$LastActivatedWindowLookup.updateLookups(LookupSensitiveAction.java:218) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction$LastActivatedWindowLookup.propertyChange(LookupSensitiveAction.java:223) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
Created attachment 56946 [details] stack trace
Reassigning to lookup, please evaluate. Thanks.
*** This issue has been marked as a duplicate of 123679 ***