Crashes constantly on the same course. (Sid Meier's Civilization 6)

Faced with the problem of crashes on the same turn. Tried everything and finally figured it out. Stood airbase near the border of another nation, the enlargement of the boundaries of the air base just had to go to the use of this nation. But since it was on a plane was crash game at this moment. Just moved the plane and the problem disappeared. Decided to share the observation, suddenly someone will help. ;-)