1.12.2猫端模组服崩溃，附崩溃报告

Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
        at blusunrize.immersiveengineering.common.EventHandler.onMerchantTrade(EventHandler.java:619)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_1183_EventHandler_onMerchantTrade_MerchantTradeOffersEvent.invoke(.dynamic)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:190)
        at net.minecraftforge.event.ForgeEventFactory.listTradeOffers(ForgeEventFactory.java:808)
        at net.minecraft.entity.passive.EntityVillager.func_70934_b(EntityVillager.java:682)
        at com.hackshop.ultimate_unicorn.mobs.MobEventHandler.onEntityJoinWorld(MobEventHandler.java:53)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_975_MobEventHandler_onEntityJoinWorld_EntityJoinWorldEvent.invoke(.dynamic)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:190)
        at net.minecraft.world.WorldServer.func_175650_b(WorldServer.java:1286)
        at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:988)
        at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:109)
        at net.minecraftforge.common.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:151)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:916)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:474)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:826)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:685)
        at java.lang.Thread.run(Unknown Source)