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java.lang.NullPointerException at ru.runa.wfe.lang.jpdl.Join.execute(Join.java:48) at ru.runa.wfe.lang.Node.enter(Node.java:153) at ru.runa.wfe.lang.Transition.take(Transition.java:85) at ru.runa.wfe.lang.Node.leave(Node.java:185) at ru.runa.wfe.lang.TaskNode.leave(TaskNode.java:84)