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java.util.ConcurrentModificationException: 	at java.util.LinkedList$ListItr.checkForComodification(	at java.util.LinkedList$	at$Adapter.write(	at$Adapter.write(	at	at$Adapter.write(	at$Adapter.write(	at	at$1.write(	at$Adapter.write(	at	at	at	at	at	at nl.lolmewn.stats.user.StatsUserManager.saveUser(	at nl.lolmewn.stats.bukkit.BukkitMain.lambda$null$2(	at java.util.concurrent.ConcurrentHashMap$ValueSpliterator.forEachRemaining(	at$Head.forEach(	at nl.lolmewn.stats.bukkit.BukkitMain.lambda$scheduleDataSaver$3(	at	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at