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via fordiac by mwc5
, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at$MapSubAppToCommand.canUndo(	at org.eclipse.gef.commands.CommandStack.canUndo(	at org.eclipse.gef.ui.actions.UndoAction.calculateEnabled(	at org.eclipse.gef.ui.actions.WorkbenchPartAction.refresh(	at org.eclipse.gef.ui.actions.UndoAction.refresh(	at org.eclipse.gef.ui.actions.WorkbenchPartAction.update(	at	at	at org.fordiac.ide.gef.DiagramEditor.commandStackChanged(Unknown Source)	at org.eclipse.gef.commands.CommandStack.notifyListeners(	at org.eclipse.gef.commands.CommandStack.execute(	at	at$4(	at$	at