[1.1.5] Meteoric crash can destroy stairs EDIT: [1.1.6] info

[Tudwell]

Rarely, meteoric crash will result in persistent lava, and can destroy stairs permanently. This happened to me on the second floor of the sludge nest. In an area that doesn't allow use of the rod of recall, this is immediately game-breaking.

Edit: In 1.1.6, meteoric crash consistently causes a LUA error (attempt to perform arithmetic on a boolean).

I found it, in games/engines/default/engine/entity.lua:
Line 876: else self[prop] = (self[prop] or 0) + v
should be
else self[prop] = (self[prop] and 1 or 0) + v

This is logically what is supposed to be happening in the original line, but the addition of "and 1" converts this into a number that can be legally added to v. I do not know if this fixes the stair problem I noted above (or if it even exists in 1.1.6).