Comment 14 for bug 1706187

Further update:

Stellarium crashes because I am using the DNS blocker pi-hole (see https://pi-hole.net/) and in its default configuration it is blocking freegeoip.net (which Stellarium tries to access).

Having figured this out, I can now easily fix this by whitelisting this domain.

However, this still looks like a bug. Stellarium should not just crash if this service does not work or returns bad data.