../../common/nation.c:563:21: runtime error: applying zero offset to null pointer
That might be something that clang analyzer reports too. (There's about 80 analyzer reports left that I've not yet looked at - there was about 320 when I started with them a year ago)
Applies to all branches, even to S2_6 (and I think the fix should go there, even though the specific symptom seen isn't critical - some other "iterator initialized while nations not in sane state" case might be)
3.0.6 clang
This is an error at each start of the server.
I searched in the net, but i don't understand the answers, maybe just something clang catches but gcc does not care about ?
Edited : ok i found, it is simple :-) , just a very strict compiler ...