Follow-up Comment #1, bug #21768 (project wesnoth):
There's nothing attached, you forgot the savefile.
However, do note that lua_function= was sort of unstable from the start, is
supposed to be used with care and the usual rule "wml/lua should never crash
wesnoth" doesn't apply.
For instance, if the code put into the called lua_function happens to remove
or add units from the unit_map, this could end up very badly, since the SUF
itself, where the funtion appears, iterates over the unit_map. So that's
deleting or adding elements from a container while iterating over it, but not
updating the iterator after the modification. It seems you are doing exactly
this. If so, then, well, it's misusage of lua_function=, which should not be
used to alter the gamestate in any way; it should only compute a boolean
return value.
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