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

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at ru.runa.gpd.editor.CopyGraphCommand.execute(
at org.eclipse.graphiti.ui.internal.editor.EmfOnGefCommand.execute(
at org.eclipse.graphiti.internal.command.GFPreparableCommand2.doExecute(
at org.eclipse.emf.transaction.RecordingCommand.execute(
at org.eclipse.emf.workspace.EMFCommandOperation.doExecute(
at org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack.execute(
at org.eclipse.graphiti.ui.internal.editor.GFWorkspaceCommandStackImpl.execute(
at org.eclipse.graphiti.ui.internal.editor.GFCommandStack.execute(

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