NPE when rebooting a computer while GPU is doing something

java.lang.NullPointerException
        at cc.gpu.shared.TileEntityGPU.render(TileEntityGPU.java:179)
        at cc.gpu.client.TileEntityGPURenderer.a(TileEntityGPURenderer.java:15)
        at ach.a(SourceFile:129)
        at ach.a(SourceFile:122)
        at l.a(RenderGlobal.java:440)
        at lr.a(EntityRenderer.java:1099)
        at lr.b(EntityRenderer.java:912)
        at EntityRendererProxy.b(EntityRendererProxy.java:21)
        at net.minecraft.client.Minecraft.x(Minecraft.java:892)
        at net.minecraft.client.Minecraft.run(Minecraft.java:747)
        at java.lang.Thread.run(Unknown Source)