Error in Sandworn Lair

[hops]

Charator created in r1614, currently played in r1622

Lua Error: /mod/ai//sandworm_tunneler.lua:44: bad argument #3 to 'new' (number expected, got nil)
At [C]:-1
At [C]:-1 new
At /mod/ai//sandworm_tunneler.lua:44
At (tail call):-1
At (tail call):-1
At /mod/class/NPC.lua:43 act
At /engine/GameEnergyBased.lua:73 tick
At /engine/GameTurnBased.lua:44 tick
At /mod/class/Game.lua:455