Freeciv

Similar to #751 in that the assertion failure is logged, and the action dialog returns.

An AI has declared war on me. Anticipating this, I built a fleet of Armor units which immeditately stormed across the border. They are able to attack any units of that nation, but some cities are un-attackable, whereas others are not. Which ones are/aren't appears deterministic, so while I would assume that I'm simply missing some obscure rule, I noticed that the following is in the console log:

1: in genlist_size() [genlist.c::194]: assertion '((void *)0) != pgenlist' failed.
1: Please report this message at https://redmine.freeciv.org/projects/freeciv

This leads me to believe that it is a bug similar to #751.

Freeciv version 3.1.1 gui-gtk-4.0