net.minecraft.util.ReportedException: Ticking player
    at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:212) ~[NetworkSystem.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:865) ~[MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743) ~[MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) ~[IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222-ea]
Caused by: java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[?:1.8.0_222-ea]
    at java.util.HashMap$KeyIterator.next(HashMap.java:1469) ~[?:1.8.0_222-ea]
    at com.crowsofwar.avatar.common.bending.fire.FireEventListener.onUpdateEvent(FireEventListener.java:150) ~[FireEventListener.class:?]
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_32_FireEventListener_onUpdateEvent_LivingUpdateEvent.invoke(.dynamic) ~[?:?]
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) ~[EventBus.class:?]
    at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:580) ~[ForgeHooks.class:?]
    at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2321) ~[EntityLivingBase.class:?]
    at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:272) ~[EntityPlayer.class:?]
    at net.minecraft.entity.player.EntityPlayerMP.onUpdateEntity(EntityPlayerMP.java:423) ~[EntityPlayerMP.class:?]
    at net.minecraft.network.NetHandlerPlayServer.update(NetHandlerPlayServer.java:185) ~[NetHandlerPlayServer.class:?]
    at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.update(NetworkDispatcher.java:212) ~[NetworkDispatcher$1.class:?]
    at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:307) ~[NetworkManager.class:?]
    at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:197) ~[NetworkSystem.class:?]