Miért crashelt ki a Minecraft?

Éppen a Direwolf20 1.5.2es verziójával játszottam, leraktam egy Maceratort, megnyitottam és befagyott a játék, majd egy ilyen crash üzenetet kaptam. Mitől lehetett?

---- Minecraft Crash Report ----

// I feel sad now :(

Time: 5/9/18 7:35 PM

Description: Ticking memory connection

java.lang.IndexOutOfBoundsException: Index: 44, Size: 43

at java.util.ArrayList.rangeCheck(Unknown Source)

at java.util.ArrayList.get(Unknown Source)

at net.minecraft.inventory.Container.func_75144_a(SourceFile:207)

at invtweaks.forge.PacketHandler.onClickPacket(PacketHandler.java:46)

at invtweaks.forge.PacketHandler.onPacketData(PacketHandler.java:23)

at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)

at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)

at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:84)

at net.minecraft.network.NetServerHandler.func_72501_a(NetServerHandler.java:1098)

at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:59)

at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)

at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:134)

at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)

at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:677)

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:573)

at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)

at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)