Crates Crashing the server

[Grishord]

Crates are crashing the server after they are accessed after a restart. This issue ONLY happens after a restart, crates can be placed and used with no issues until after a restart, this is the error I'm looking at:

Suggestions?

2013-08-29 01:21:24 [WARNING] Failed to handle packet for Grishord: java.lang.ArithmeticException: / by zero

java.lang.ArithmeticException: / by zero

at net.mcft.copy.betterstorage.container.ContainerCrate.<init>(ContainerCrate.java:27)

at net.mcft.copy.betterstorage.block.crate.TileEntityCrate.createContainer(TileEntityCrate.java:213)

at net.mcft.copy.betterstorage.block.crate.TileEntityCrate.openGui(TileEntityCrate.java:207)

at net.mcft.copy.betterstorage.block.crate.BlockCrate.func_71903_a(BlockCrate.java:53)

at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:575)

at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:874)

at net.minecraft.network.packet.Packet15Place.func_73279_a(SourceFile:58)

at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:442)

at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:222)

at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)

at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:847)

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:320)

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:716)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:600)

at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)