Error with null inventorystacks

Slots: [Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Inv Block,Ingot Item,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Air,Inv Block,Ingot Item,Air,Air,Air,Air,Air,Air,Air,
Stacks: []
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:657)
	at java.util.ArrayList.get(ArrayList.java:433)
	at net.minecraft.util.NonNullList.get(NonNullList.java:45)
	at nathanMeyer.mods.tmpi.client.gui.inventory.ContainerInvsee.detectAndSendChanges(ContainerInvsee.java:48)
	at net.minecraft.entity.player.EntityPlayerMP.tick(EntityPlayerMP.java:349)
	at net.minecraft.world.World.tickEntity(World.java:1406)
	at net.minecraft.world.WorldServer.tickEntity(WorldServer.java:575)
	at net.minecraft.world.World.tickEntity(World.java:1376)
	at net.minecraft.world.WorldServer.tickPlayers(WorldServer.java:503)
	at net.minecraft.world.World.tickEntities(World.java:1206)
	at net.minecraft.world.WorldServer.tickEntities(WorldServer.java:482)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:801)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:724)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:122)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:611)
	at java.lang.Thread.run(Thread.java:748)
[19:58:30.344] [Server thread/INFO] [minecraft/IntegratedServer]: Saving and pausing game...
[19:58:30.359] [Server thread/INFO] [minecraft/MinecraftServer]: Saving chunks for level 'Test World Please Ignore'/minecraft:overworld
[19:58:30.360] [Server thread/DEBUG] [ne.mi.fm.FMLWorldPersistenceHook/WP]: Gathering id map for writing to world save Test World Please Ignore