<URL: http://bugs.freeciv.org/Ticket/Display.html?id=40020 >
For posterity, several more hours of solid debugging, and I've determined the
unit itself has lost its name. A dead unit wasn't taken off the tile?
2: maybe_make_contact() unit
And a dead city wasn't taken off the tile owner list before begin_phase().
1: Failed sanitycheck.c:174 (srv_main.c:725) at Grassland (50,28):
map_get_player_site(ptile, tile_owner(ptile)) != NULL
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