org.eclipse.jface.text.Assert$AssertionFailedException: null argument;

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org.eclipse.jface.text.Assert$AssertionFailedException: null argument;
at org.eclipse.jface.text.Assert.isNotNull(Assert.java:157)
at org.eclipse.jface.text.Assert.isNotNull(Assert.java:133)
at org.eclipse.jface.text.contentassist.ContentAssistant.fireSessionBeginEvent(ContentAssistant.java:1992)
at org.eclipse.jface.text.contentassist.ContentAssistant.prepareToShowCompletions(ContentAssistant.java:1469)
at org.eclipse.jdt.text.tests.contentassist.AbstractCompletionTest.incrementalAssist(AbstractCompletionTest.java:489)
at org.eclipse.jdt.text.tests.contentassist.AbstractCompletionTest.assertIncrementalCompletion(AbstractCompletionTest.java:311)
at org.eclipse.jdt.text.tests.contentassist.AbstractCompletionTest.assertMethodBodyIncrementalCompletion(AbstractCompletionTest.java:211)
at org.eclipse.jdt.text.tests.contentassist.TypeCompletionTest.testNoIncrementalInsertionPrefixCorrection(TypeCompletionTest.java:232)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:330)
at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:204)
at org.eclipse.test.UITestApplication$3.run(UITestApplication.java:188)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3141)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.test.UITestApplication.runApplication(UITestApplication.java:131)
at org.eclipse.test.UITestApplication.run(UITestApplication.java:58)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:396)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.apache.harmony.vm.JarRunner.main(JarRunner.java:80)

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