Crash report for Thaumcraft and a Crook

 at thaumcraft.common.blocks.BlockAiry.isLeaves(BlockAiry.java:129)
18:29:04 at exnihilo.items.ItemCrook.func_77638_a(ItemCrook.java:59)
18:29:04 at net.minecraft.item.ItemTool.getStrVsBlock(ItemTool.java:127)
18:29:04 at net.minecraft.entity.player.EntityPlayer.getCurrentPlayerStrVsBlock(EntityPlayer.java:887)
18:29:04 at net.minecraftforge.common.ForgeHooks.blockStrength(ForgeHooks.java:170)
18:29:04 at net.minecraft.block.Block.func_71908_a(Block.java:703)
18:29:04 at net.minecraft.item.ItemInWorldManager.func_73074_a(ItemInWorldManager.java:194)
18:29:04 at net.minecraft.network.NetServerHandler.func_72510_a(NetServerHandler.java:493)
18:29:04 at net.minecraft.network.packet.Packet14BlockDig.func_73279_a(SourceFile:46)
18:29:04 at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
18:29:04 at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
18:29:04 at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
18:29:04 at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
18:29:04 at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
18:29:04 at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
18:29:04 at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
18:29:04 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
18:29:04 at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)