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java.lang.IndexOutOfBoundsException: Index: 0	at java.util.Collections$EmptyList.get(Collections.java:4454)	at com.gmail.nossr50.util.player.UserManager.getPlayer(UserManager.java:94)	at com.gmail.nossr50.util.player.UserManager.saveAll(UserManager.java:55)	at com.gmail.nossr50.mcMMO.onDisable(mcMMO.java:206)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:294)	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:344)	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:427)	at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:420)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.disablePlugins(CraftServer.java:344)	at net.minecraft.server.v1_10_R1.MinecraftServer.stop(MinecraftServer.java:460)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:667)	at java.lang.Thread.run(Thread.java:745)