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

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via GitHub by brodee
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via Atlassian JIRA by Steve Smith [SYD/AMS/LHR], 2 years ago
This exception has no message.
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)