Consumable items which crash the game when 'U'sed from the weapon or missile slot (unless you have multiple of the exact same item in your inventory - in which case one from the inventory is erroneously used, OR you don't have any items of the same type in your inventory): food (unless it is a 'u'sable herb), potions (except for water), scrolls, and books (in this case it doesn't matter what is in your inventory).

The error message is "Trying to remove a non-existent item('<foo>')".

Wands usually only cause this crash when 'U'sed from the missile slot, but wielded wands can have a similar issue with certain settings (http://www.adom.de/forums/project.php?issueid=4350).