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

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java.lang.NullPointerException:
at ru.runa.gpd.lang.model.MultiSubprocess.isCompatibleVariables(MultiSubprocess.java:27)
at ru.runa.gpd.lang.model.Subprocess.validate(Subprocess.java:57)
at ru.runa.gpd.lang.model.MultiSubprocess.validate(MultiSubprocess.java:16)
at ru.runa.gpd.lang.model.GraphElement.validate(GraphElement.java:136)
at ru.runa.gpd.lang.model.ProcessDefinition.validate(ProcessDefinition.java:227)
at ru.runa.gpd.lang.par.ProcessDefinitionValidator.validateDefinition(ProcessDefinitionValidator.java:34)
at ru.runa.gpd.editor.ProcessEditorBase.doSave(ProcessEditorBase.java:280)
at ru.runa.gpd.ui.action.Save.run(Save.java:9)

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