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

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java.lang.NullPointerException:
at org.pentaho.di.ui.spoon.trans.StepPerformanceSnapShotDialog.(StepPerformanceSnapShotDialog.java:92)
at org.pentaho.di.ui.spoon.trans.TransLog.showStepPerformanceGraph(TransLog.java:468)
at org.pentaho.di.ui.spoon.trans.TransLog.access$13(TransLog.java:467)
at org.pentaho.di.ui.spoon.trans.TransLog$12.widgetSelected(TransLog.java:444)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:876)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:5624)
at org.pentaho.di.ui.spoon.Spoon.run(Spoon.java:5720)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:379)

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