java.lang.NullPointerException: This exception has no message.

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This exception has no message.
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at javax.swing.plaf.basic.BasicTreeUI.isLocationInExpandControl(
at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(
at com.intellij.openapi.wm.impl.IdeGlassPaneImpl.a(
at com.intellij.openapi.wm.impl.IdeGlassPaneImpl.dispatch(
at com.intellij.ide.IdeEventQueue._dispatchEvent(
at com.intellij.ide.IdeEventQueue.b(
at java.awt.EventDispatchThread.pumpOneEventForFilters(
at java.awt.EventDispatchThread.pumpEventsForFilter(
at java.awt.EventDispatchThread.pumpEventsForHierarchy(
at java.awt.EventDispatchThread.pumpEvents(
at java.awt.EventDispatchThread.pumpEvents(

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