[18:55:54] [Server thread/WARN]: [BetterEnderChest] Task #76 for BetterEnderChest v2.1.3 generated an exception
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839) ~[?:1.7.0_03]
at java.util.HashMap$EntryIterator.next(HashMap.java:880) ~[?:1.7.0_03]
at java.util.HashMap$EntryIterator.next(HashMap.java:878) ~[?:1.7.0_03]
at nl.rutgerkok.betterenderchest.mysql.BetterEnderSQLCache.addChestsToAutoSave(BetterEnderSQLCache.java:101) ~[?:?]
at nl.rutgerkok.betterenderchest.mysql.BetterEnderSQLCache$2.run(BetterEnderSQLCache.java:71) ~[?:?]
at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:67) ~[spigot.jar:git-Spigot-1322]
at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [spigot.jar:git-Spigot-1322]
at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:614) [spigot.jar:git-Spigot-1322]
at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273) [spigot.jar:git-Spigot-1322]
at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562) [spigot.jar:git-Spigot-1322]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469) [spigot.jar:git-Spigot-1322]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1322]