This happened occasionally. Here is the stacktrace;
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Scheduler callback exception. Callback: com.smartfoxserver.bitswarm.sessions.DefaultSessionManager$SessionCleaner@90d9c17, Exception: java.lang.NullPointerException
com.smartfoxserver.v2.util.monitor.GhostUserHunter.buildReport(GhostUserHunter.java:93)
com.smartfoxserver.v2.util.monitor.GhostUserHunter.hunt(GhostUserHunter.java:59)
com.smartfoxserver.v2.SmartFoxServer$NetworkEvtListener.handleEvent(SmartFoxServer.java:996)
com.smartfoxserver.bitswarm.service.BaseCoreService.dispatchEvent(BaseCoreService.java:110)
com.smartfoxserver.bitswarm.sessions.DefaultSessionManager.applySessionCleaning(DefaultSessionManager.java:743)
com.smartfoxserver.bitswarm.sessions.DefaultSessionManager.access$0(DefaultSessionManager.java:688)
com.smartfoxserver.bitswarm.sessions.DefaultSessionManager$SessionCleaner.doTask(DefaultSessionManager.java:86)
com.smartfoxserver.bitswarm.util.scheduling.Scheduler.executeTasks(Scheduler.java:214)
com.smartfoxserver.bitswarm.util.scheduling.Scheduler.run(Scheduler.java:152)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
java.lang.Thread.run(Thread.java:722)