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

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java.lang.NullPointerException:
at me.ryanhamshire.griefprevention.claim.Claim.getOwnerUniqueId(Claim.java:157)
at me.ryanhamshire.griefprevention.event.BlockEventHandler.onBlockNotify(BlockEventHandler.java:177)
at org.spongepowered.common.event.listener.NotifyNeighborBlockEventListener_BlockEventHandler_onBlockNotify64.handle(Unknown Source)
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:201)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:184)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:229)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:214)
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:129)
at org.spongepowered.common.event.SpongeCommonEventFactory.callNotifyNeighborEvent(SpongeCommonEventFactory.java:623)
at dan200.computercraft.shared.util.RedstoneUtil.propogateRedstoneOutput(RedstoneUtil.java:90)
at dan200.computercraft.shared.computer.blocks.TileComputerBase.updateOutput(TileComputerBase.java:344)
at dan200.computercraft.shared.computer.blocks.TileComputerBase.func_73660_a(TileComputerBase.java:214)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:701)
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)

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