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java.util.ConcurrentModificationException at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)[?:1.8.0_121] at java.util.LinkedList$ListItr.next(LinkedList.java:888)[?:1.8.0_121] at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:95)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:239)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.write(MapTypeAdapterFactory.java:145)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:89)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:195)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.Gson.toJson(Gson.java:593)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.Gson.toJson(Gson.java:572)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.Gson.toJson(Gson.java:527)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at com.google.gson.Gson.toJson(Gson.java:507)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at nl.lolmewn.stats.storage.FlatfileStorageEngine.save(FlatfileStorageEngine.java:88)[?:?] at nl.lolmewn.stats.user.StatsUserManager.saveUser(StatsUserManager.java:36)[?:?] at nl.lolmewn.stats.bukkit.BukkitMain.lambda$null$2(BukkitMain.java:281)[?:?] at java.util.concurrent.ConcurrentHashMap$ValueSpliterator.forEachRemaining(ConcurrentHashMap.java:3566)[?:1.8.0_121] at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)[?:1.8.0_121] at nl.lolmewn.stats.bukkit.BukkitMain.lambda$scheduleDataSaver$3(BukkitMain.java:279)[?:?] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:71)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52)[spigot-1.10.2.jar:git-Spigot-de459a2-51263e9] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_121] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_121] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_121]