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java.lang.NullPointerException: 	at ru.runa.gpd.editor.CopyGraphCommand.execute(CopyGraphCommand.java:160)	at org.eclipse.graphiti.ui.internal.editor.EmfOnGefCommand.execute(EmfOnGefCommand.java:54)	at org.eclipse.graphiti.internal.command.GFPreparableCommand2.doExecute(GFPreparableCommand2.java:37)	at org.eclipse.emf.transaction.RecordingCommand.execute(RecordingCommand.java:135)	at org.eclipse.emf.workspace.EMFCommandOperation.doExecute(EMFCommandOperation.java:119)	at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150)	at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:513)	at org.eclipse.emf.workspace.impl.WorkspaceCommandStackImpl.doExecute(WorkspaceCommandStackImpl.java:208)	at org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack.execute(AbstractTransactionalCommandStack.java:165)	at org.eclipse.graphiti.ui.internal.editor.GFWorkspaceCommandStackImpl.execute(GFWorkspaceCommandStackImpl.java:83)	at org.eclipse.graphiti.ui.internal.editor.GFCommandStack.execute(GFCommandStack.java:124)	at org.eclipse.gef.ui.actions.WorkbenchPartAction.execute(WorkbenchPartAction.java:83)	at ru.runa.gpd.editor.PasteAction.run(PasteAction.java:30)	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)