Time: 18/10/19 15:38
Description: Exception in server tick loop

java.util.ConcurrentModificationException: null
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[?:1.8.0_222] {}
	at java.util.ArrayList$Itr.next(ArrayList.java:859) ~[?:1.8.0_222] {}
	at com.direwolf20.buildinggadgets.common.inventory.PlayerItemIndex.insertIntoEmptyHandles(PlayerItemIndex.java:82) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.inventory.PlayerItemIndex.performSimpleInsert(PlayerItemIndex.java:60) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.inventory.PlayerItemIndex.lambda$insertObject$0(PlayerItemIndex.java:46) ~[classes/:?] {re:classloading}
	at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_222] {}
	at com.direwolf20.buildinggadgets.common.inventory.PlayerItemIndex.insertObject(PlayerItemIndex.java:46) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.inventory.PlayerItemIndex.insert(PlayerItemIndex.java:34) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.inventory.IItemIndex.insert(IItemIndex.java:9) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.concurrent.UndoScheduler.undoBlock(UndoScheduler.java:63) ~[classes/:?] {re:classloading}
	at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet.lambda$entryConsumer$0(Collections.java:1577) ~[?:1.8.0_222] {}
	at java.util.Spliterators$ArraySpliterator.tryAdvance(Spliterators.java:958) ~[?:1.8.0_222] {}
	at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$UnmodifiableEntrySetSpliterator.tryAdvance(Collections.java:1596) ~[?:1.8.0_222] {}
	at com.direwolf20.buildinggadgets.common.concurrent.UndoScheduler.advance(UndoScheduler.java:53) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.concurrent.SteppedScheduler.getAsBoolean(SteppedScheduler.java:27) ~[classes/:?] {re:classloading}
	at com.direwolf20.buildinggadgets.common.concurrent.ServerTickingScheduler.tick(ServerTickingScheduler.java:44) ~[classes/:?] {re:classloading}
	at net.minecraftforge.eventbus.ASMEventHandler_27_ServerTickingScheduler_tick_ServerTickEvent.invoke(.dynamic) ~[?:?] {}
	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-1.0.0-service.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-1.0.0-service.jar:?] {}
	at net.minecraftforge.fml.hooks.BasicEventHooks.onPreServerTick(BasicEventHooks.java:114) ~[?:?] {re:classloading}
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:798) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_222] {}