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java.lang.NullPointerException: Null key.	at com.vexsoftware.votifier.json.JSONObject.put(JSONObject.java:1138)	at com.vexsoftware.votifier.bungee.forwarding.cache.FileVoteCache.save(FileVoteCache.java:73)	at com.vexsoftware.votifier.bungee.forwarding.cache.FileVoteCache$1.run(FileVoteCache.java:36)	at net.md_5.bungee.scheduler.BungeeTask.run(BungeeTask.java:63)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)