java.lang.NullPointerException

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    • java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936) at mage.server.ChatManager.leaveChat(ChatManager.java:75) at mage.server.MageServerImpl$14.execute(MageServerImpl.java:562) at mage.server.MageServerImpl$53.run(MageServerImpl.java:1177) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

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