[Freeciv-Dev] (PR#14341) server crash with ai and future techs

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=14341 >

I was playing a game - a heavily patched server and client, but none of 
the patches affect techs.  Then there's this crash.

(gdb) bt
#0  0xb7da99e7 in raise () from /lib/tls/libc.so.6
#1  0xb7dab31b in abort () from /lib/tls/libc.so.6
#2  0xb7da2885 in __assert_fail () from /lib/tls/libc.so.6
#3  0x08116b05 in get_invention (pplayer=0x82b11c8, tech=199) at tech.c:62
#4  0x081175ac in base_total_bulbs_required (pplayer=0x82b11c8, tech=199)
     at tech.c:423
#5  0x0811756e in total_bulbs_required (pplayer=0x82b11c8) at tech.c:386
#6  0x08128ccb in adjust_building_want_by_effects (pcity=0x8677bc0, id=43)
     at aicity.c:488
#7  0x0812a36d in ai_manage_buildings (pplayer=0x82b11c8) at aicity.c:912
#8  0x0805119e in begin_phase (is_new_phase=true) at srv_main.c:546
#9  0x080532d2 in main_loop () at srv_main.c:1554
#10 0x08053cc4 in srv_loop () at srv_main.c:1884
#11 0x080535b3 in srv_main () at srv_main.c:1684
#12 0x0804af69 in main (argc=8, argv=0xbfd47cc4) at civserver.c:242

The city in #6 is owned by me.  I am not researching future techs yet! 
The year is 1000 and I haven't quite made it to industrialism.

-jason