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[21:02:05] [Client thread/ERROR] [FML]: FMLIndexedMessageCodec exception caught
java.lang.NullPointerException: null
at net.minecraftforge.fml.common.network.FMLOutboundHandler$OutboundTarget$5.selectNetworks(FMLOutboundHandler.java:162) ~[FMLOutboundHandler$OutboundTarget$5.class:?]
at net.minecraftforge.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:378) ~[FMLOutboundHandler.class:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:816) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:723) ~[netty-all-4.1.9.Final.jar:4.1.9.Final]
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445)
at java.util.HashMap$ValueIterator.next(HashMap.java:1474)
at net.minecraft.world.World.addTileEntities(World.java:1946)
at net.minecraft.world.chunk.Chunk.onLoad(Chunk.java:856)
at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:109)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:94)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:89)
at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:135)