LUA bug

[Achievement:BugFound]

I hit a duathedlen (with 584 HP) that was standing on a unstable wormhole in the Spider Cave with my You Shall Be My Weapon and achieved this LUA bug.

/engine/interface/ActorTalents.lua:250: in function </engine/interface/ActorTalents.lua:234>
Lua Error: /engine/interface/ActorTalents.lua:273: /engine/interface/ActorTalents.lua:250: /engine/interface/ActorTalents.lua:150: /engine/utils.lua attempt to index a nil value
stack traceback:
/engine/utils.lua in function 'coordToDir'
/data/talents/uber/str.lua:58: in function </data/talents/uber/str.lua:48>
[C]: in function 'xpcall'
/engine/interface/ActorTalents.lua:147: in function </engine/interface/ActorTalents.lua:140>
At [C]:-1
At [C]:-1 error
At /engine/interface/ActorTalents.lua:273 useTalent
At /engine/interface/PlayerHotkeys.lua:170
At /engine/interface/PlayerHotkeys.lua:162 activateHotkey
At /engine/HotkeysIconsDisplay.lua:384 onMouse
At /mod/class/uiset/Minimalist.lua:1785 fct
At /engine/Mouse.lua:58

HH hits something for (1200 shifted), 0 physical, 6 mind, 14 light, 9 darkness, (30 total damage)

A few turns later I killed it with a stunning blow (it had been moved backed from the You Shall Be My Weapon)