Bukkit/CraftBukkit — comment on commit 1b47f6edde03230c4c13238573e4a4a6bae0b071
File:  line 0
By andf54:

My plugin gets a NullPointerException after latest update when I try to remove an item.

at org.bukkit.craftbukkit.inventory.CraftInventory.first(CraftInventory.java:177)
at org.bukkit.craftbukkit.inventory.CraftInventory.removeItem(CraftInventory.java:297)

It seems to happen when there are empty slots between the removable item and 0 slot.