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What steps will reproduce the problem? 1. Open https://hudson.eclipse.org/hudson/job/mylyn-integration-e3.7/29/ 2. Double click CVS revision in Changes viewer -- Error Details -- Exception Stack Trace: org.eclipse.core.runtime.AssertionFailedException: null argument: at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85) at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73) at org.eclipse.team.internal.ui.history.FileRevisionTypedElement.<init>(FileRevisionTypedElement.java:49) at org.eclipse.mylyn.versions.ui.ScmUi.openCompareEditor(ScmUi.java:55) at org.eclipse.mylyn.internal.builds.ui.editor.ChangesPart.open(ChangesPart.java:189) at org.eclipse.mylyn.internal.builds.ui.editor.ChangesPart.access$1(ChangesPart.java:173) at org.eclipse.mylyn.internal.builds.ui.editor.ChangesPart$2.open(ChangesPart.java:148) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:843) [...]
Added null check.