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java.lang.NullPointerException: 	at sonar.core.common.tileentity.TileEntitySonar.isClient(TileEntitySonar.java:44)	at sonar.core.common.tileentity.TileEntitySidedInventory.func_145839_a(TileEntitySidedInventory.java:19)	at net.minecraft.tileentity.TileEntity.func_190200_a(TileEntity.java:123)	at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadEntities(AnvilChunkLoader.java:486)	at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:96)	at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:94)	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:115)	at net.minecraft.world.gen.ChunkProviderServer.func_186028_c(ChunkProviderServer.java:86)	at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:132)	at net.minecraft.world.World.func_72964_e(World.java:301)	at net.minecraft.world.World.func_175726_f(World.java:296)	at net.minecraft.world.World.func_180495_p(World.java:840)	at net.minecraft.world.World.func_175627_a(World.java:3174)	at net.minecraft.world.World.func_175676_y(World.java:3201)	at net.minecraft.world.World.func_175651_c(World.java:3242)	at net.minecraft.world.World.func_175687_A(World.java:3256)	at crazypants.enderio.conduit.liquid.AbstractLiquidConduit.isConditionMetByExternalSignal(AbstractLiquidConduit.java:149)	at crazypants.enderio.conduit.liquid.AbstractLiquidConduit.autoExtractForDir(AbstractLiquidConduit.java:135)	at crazypants.enderio.conduit.liquid.LiquidConduit.doExtract(LiquidConduit.java:124)	at crazypants.enderio.conduit.liquid.LiquidConduit.updateEntity(LiquidConduit.java:94)	at crazypants.enderio.conduit.TileConduitBundle.doUpdate(TileConduitBundle.java:229)	at com.enderio.core.common.TileEntityBase.func_73660_a(TileEntityBase.java:36)	at net.minecraft.world.World.func_72939_s(World.java:1802)	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:618)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Thread.java:745)