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

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via fordiac by mwc5
, 1 year ago
This exception has no message.
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 org.fordiac.ide.gef.DiagramEditor.commandStackChanged(Unknown Source)
at org.eclipse.gef.commands.CommandStack.notifyListeners(

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