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

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java.lang.NullPointerException:
at org.terracotta.ui.session.NonPortableObjectPanel.setEvent(NonPortableObjectPanel.java:509)
at org.terracotta.ui.session.SessionIntegratorFrame.handleNonPortableReason(SessionIntegratorFrame.java:2000)
at org.terracotta.ui.session.SessionIntegratorFrame.access$6700(SessionIntegratorFrame.java:101)
at org.terracotta.ui.session.SessionIntegratorFrame$DSOAppEventListener$1.run(SessionIntegratorFrame.java:1984)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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