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

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This exception has no message.
java.lang.NullPointerException:
at javax.swing.text.View.getToolTipText(View.java:1041)
at javax.swing.plaf.basic.BasicTextUI.getToolTipText(BasicTextUI.java:1240)
at com.intellij.ide.IdeTooltipManager.isTooltipDefined(IdeTooltipManager.java:201)
at com.intellij.ide.IdeTooltipManager.maybeShowFor(IdeTooltipManager.java:180)
at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2425)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2317)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2275)
at java.awt.Component.dispatchEventImpl(Component.java:4785)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4538)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:863)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:695)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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