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via GitHub by hsyyid
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This exception has no message.
java.lang.Error: 	at net.minecraft.block.BlockPistonMoving.func_180663_b(BlockPistonMoving.java:49)	at net.minecraft.world.chunk.Chunk.setBlockState(Chunk.java:528)	at net.minecraft.world.World.func_180501_a(World.java:1168)	at org.spongepowered.common.block.SpongeBlockSnapshot.restore(SpongeBlockSnapshot.java:187)	at org.spongepowered.common.event.CauseTracker.processList(CauseTracker.java:994)	at org.spongepowered.common.event.CauseTracker.handleBlockCaptures(CauseTracker.java:803)	at net.minecraft.block.BlockPistonBase.handler$onDoMoveReturn$0(BlockPistonBase.java:84)	at net.minecraft.block.BlockPistonBase.func_176319_a(BlockPistonBase.java:423)	at net.minecraft.block.BlockPistonBase.func_180648_a(BlockPistonBase.java:150)	at net.minecraft.world.WorldServer.func_147485_a(WorldServer.java:1053)	at net.minecraft.world.WorldServer.func_147488_Z(WorldServer.java:1040)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:234)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:690)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)	at java.lang.Thread.run(Thread.java:745)