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This bug was originally marked as duplicate of bug 127368, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 (Build 20151231-debian-8.1) VM: OpenJDK 64-Bit Server VM, 25.121-b13, OpenJDK Runtime Environment, 1.8.0_121-8u121-b13-0ubuntu1.16.04.2-b13 OS: Linux User Comments: kamyar: Not sure when exactly it happened, sorry! Stacktrace: java.lang.IllegalArgumentException: view is invalid at javax.help.search.MergingSearchEngine.merge(MergingSearchEngine.java:91) at javax.help.JHelpSearchNavigator.merge(JHelpSearchNavigator.java:168) at javax.help.plaf.basic.BasicSearchNavigatorUI.addSubHelpSets(BasicSearchNavigatorUI.java:275) at javax.help.plaf.basic.BasicSearchNavigatorUI.reloadData(BasicSearchNavigatorUI.java:225) at javax.help.plaf.basic.BasicSearchNavigatorUI.installUI(BasicSearchNavigatorUI.java:174) at javax.swing.JComponent.setUI(JComponent.java:666)
Created attachment 163662 [details] stacktrace