Follow-up Comment #5, bug #24072 (project freeciv):
A way to have a valid city pointer for which city_tile() returns NULL is
"ghost" or "invisible" cities, which are created on the client when it sees a
tile_info containing an unknown city ID in 'worked'.
Not sure in what circumstance you could be trading with a city you only know
about this way.
mir3x, is it possible that someone else just established a trade route with
one of your cities?
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