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

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java.lang.NullPointerException:
at ru.runa.wf.logic.bot.WorkflowThreadPoolBotInvoker.scheduleTasks(WorkflowThreadPoolBotInvoker.java:177)
at ru.runa.wf.logic.bot.WorkflowThreadPoolBotInvoker.run(WorkflowThreadPoolBotInvoker.java:153)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)

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