[Designer] Exception thrown on workspace shutdown

When testing against the latest M2 build and shutting down a workbench, I see this in my development console:

!ENTRY org.teiid.designer.dqp.ui 4 0 2010-09-01 09:54:43.401
!MESSAGE
!STACK 0
java.lang.reflect.InvocationTargetException
at com.metamatrix.modeler.dqp.ui.DqpUiPlugin$1.run(DqpUiPlugin.java:194)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Caused by: java.lang.NullPointerException
at com.metamatrix.modeler.dqp.ui.DqpUiPlugin$1.run(DqpUiPlugin.java:189)
... 1 more
Root exception:
java.lang.NullPointerException
at com.metamatrix.modeler.dqp.ui.DqpUiPlugin$1.run(DqpUiPlugin.java:189)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)