Gem Error

java.lang.NullPointerException: Ticking block entity
        at java.util.Arrays$ArrayList.<init>(Unknown Source)
        at java.util.Arrays.asList(Unknown Source)
        at witchinggadgets.common.blocks.tiles.TileEntityCuttingTable.getOutput(TileEntityCuttingTable.java:89)
        at witchinggadgets.common.blocks.tiles.TileEntityCuttingTable.func_145845_h(TileEntityCuttingTable.java:31)
        at net.minecraft.world.World.func_72939_s(World.java:1939)
        at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
        at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)