java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at net.glowstone.entity.objects.GlowItemFrame.getFacingNumber(GlowItemFrame.java:53)
at net.glowstone.entity.objects.GlowItemFrame.getFacingNumber(GlowItemFrame.java:283)
at net.glowstone.io.entity.ItemFrameStore.save(ItemFrameStore.java:39)
at net.glowstone.io.entity.ItemFrameStore.save(ItemFrameStore.java:9)
at net.glowstone.io.entity.EntityStorage.save(EntityStorage.java:172)
at net.glowstone.io.anvil.AnvilChunkIoService.write(AnvilChunkIoService.java:214)
at net.glowstone.ChunkManager.performSave(ChunkManager.java:416)
at net.glowstone.GlowChunk.unload(GlowChunk.java:211)
at net.glowstone.ChunkManager.unloadOldChunks(ChunkManager.java:189)
at net.glowstone.GlowWorld.saveWorld(GlowWorld.java:437)
at net.glowstone.GlowWorld.pulse(GlowWorld.java:373)
at net.glowstone.scheduler.WorldScheduler$WorldThread.run(WorldScheduler.java:139)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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