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

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java.lang.NullPointerException:
at com.sun.java.swing.plaf.windows.XPStyle$Skin.getWidth(XPStyle.java:513)
at com.sun.java.swing.plaf.windows.XPStyle$Skin.getWidth(XPStyle.java:517)
at com.sun.java.swing.plaf.windows.WindowsTreeUI$ExpandedIcon.getIconWidth(WindowsTreeUI.java:138)
at javax.swing.plaf.basic.BasicTreeUI.isLocationInExpandControl(BasicTreeUI.java:2165)
at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2148)
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3511)
at com.intellij.openapi.wm.impl.IdeGlassPaneImpl.a(IdeGlassPaneImpl.java:361)
at com.intellij.openapi.wm.impl.IdeGlassPaneImpl.dispatch(IdeGlassPaneImpl.java:188)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:504)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:420)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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