2019-03-30 06:14:54.155 [urn:ietf:params:xml:ns:xmpp-sasl Queue Worker 3]  SaslAuth.saveIntoBruteForceLocker()  WARNING: Cannot update BruteForceLocker
java.lang.NullPointerException
        at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
        at tigase.auth.BruteForceLockerBean$StatHolder.add(BruteForceLockerBean.java:532)
        at tigase.auth.BruteForceLockerBean$StatHolder.addIP(BruteForceLockerBean.java:466)
        at tigase.auth.BruteForceLockerBean.addToStatistic(BruteForceLockerBean.java:334)
        at tigase.auth.BruteForceLockerBean.addInvalidLogin(BruteForceLockerBean.java:157)
        at tigase.auth.BruteForceLockerBean.addInvalidLogin(BruteForceLockerBean.java:103)
        at tigase.xmpp.impl.SaslAuth.saveIntoBruteForceLocker(SaslAuth.java:375)
        at tigase.xmpp.impl.SaslAuth.process(SaslAuth.java:253)
        at tigase.server.xmppsession.SessionManager$ProcessorWorkerThread.process(SessionManager.java:2587)
        at tigase.util.processing.WorkerThread.run(WorkerThread.java:68)