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

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at net.glowstone.entity.objects.GlowItemFrame.getFacingNumber(
at net.glowstone.entity.objects.GlowItemFrame.getFacingNumber(
at net.glowstone.ChunkManager.performSave(
at net.glowstone.GlowChunk.unload(
at net.glowstone.ChunkManager.unloadOldChunks(
at net.glowstone.GlowWorld.saveWorld(
at net.glowstone.GlowWorld.pulse(
at net.glowstone.scheduler.WorldScheduler$
at java.util.concurrent.Executors$
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$

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