java.lang.NullPointerException: no model found by name sub1.ID3

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java.lang.NullPointerException: no model found by name sub1.ID3
at ru.runa.wfe.graph.history.model.DiagramModel.getNodeNotNull(DiagramModel.java:58)
at ru.runa.wfe.graph.history.GraphHistoryBuilder.createDiagram(GraphHistoryBuilder.java:198)
at ru.runa.wfe.execution.logic.ExecutionLogic.getProcessHistoryDiagramElements(ExecutionLogic.java:307)

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