crash while entering the nether in 1.8

trying to enter the nether instantly crashes the game and doesn't allow entry until the mod's removed. it gives this message:
java.lang.IndexOutOfBoundsException: Index: 7, Size: 7
    at java.util.ArrayList.rangeCheck(Unknown Source) ~[?:1.8.0_45]
    at java.util.ArrayList.get(Unknown Source) ~[?:1.8.0_45]
    at net.mobtalker.mobtalker2.entity.ai.EntityAiTaskUtil.replaceIndex(EntityAiTaskUtil.java:134) ~[EntityAiTaskUtil.class:?]
    at net.mobtalker.mobtalker2.entity.monster.ZombieAdapterInitializer.initialize(ZombieAdapterInitializer.java:22) ~[ZombieAdapterInitializer.class:?]
    at net.mobtalker.mobtalker2.entity.monster.ZombieAdapterInitializer.initialize(ZombieAdapterInitializer.java:11) ~[ZombieAdapterInitializer.class:?]
    at net.mobtalker.mobtalker2.interaction.InteractionRegistry.initialize(InteractionRegistry.java:268) ~[InteractionRegistry.class:?]
    at net.mobtalker.mobtalker2.interaction.InteractionRegistry.onEntityJoin(InteractionRegistry.java:507) ~[InteractionRegistry.class:?]
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_33_InteractionRegistry_onEntityJoin_EntityJoinWorldEvent.invoke(.dynamic) ~[?:?]
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:55) ~[ASMEventHandler.class:?]
    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:138) [EventBus.class:?]
    at net.minecraft.world.World.func_175650_b(World.java:3128) [aqu.class:?]
    at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:952) [bfh.class:?]
    at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:46) [ChunkIOProvider.class:?]
    at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12) [ChunkIOProvider.class:?]
    at net.minecraftforge.common.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:189) [AsynchronousExecutor$Task.class:?]
    at net.minecraftforge.common.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:354) [AsynchronousExecutor.class:?]
    at net.minecraftforge.common.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:30) [ChunkIOExecutor.class:?]
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:665) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:164) [cyk.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
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