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

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java.lang.NullPointerException:
at org.eclipse.ui.internal.PartService.partDeactivated(PartService.java:120)
at org.eclipse.ui.internal.WorkbenchPage.firePartDeactivated(WorkbenchPage.java:5027)
at org.eclipse.ui.internal.WorkbenchPage.access$21(WorkbenchPage.java:5020)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartDeactivated(PartServiceImpl.java:263)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:688)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:54)
at org.eclipse.e4.core.internal.contexts.ContextObjectSupplier$ContextInjectionListener.update(ContextObjectSupplier.java:90)
at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:111)
at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:343)
at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:358)
at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:197)
at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)
at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)
at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)
at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:161)
at org.eclipse.e4.core.internal.contexts.osgi.EclipseContextOSGi.dispose(EclipseContextOSGi.java:106)
at org.eclipse.e4.core.internal.contexts.osgi.EclipseContextOSGi.bundleChanged(EclipseContextOSGi.java:139)
at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:903)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEventPrivileged(EquinoxEventPublisher.java:213)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:120)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:112)
at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor.publishModuleEvent(EquinoxContainerAdaptor.java:156)
at org.eclipse.osgi.container.Module.publishEvent(Module.java:476)
at org.eclipse.osgi.container.Module.doStop(Module.java:634)
at org.eclipse.osgi.container.Module.stop(Module.java:498)
at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:191)
at java.lang.Thread.run(Thread.java:745)

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