[Freeciv-Dev] (PR#13385) server crash in get_invention

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=13385 >

This is with current CVS plus the unknown-goto patch (PR#6977).  However
the latter is unlikely to be responsible.

Not reproducable as it happened while I was playing a single-player
game.  It happened about 20 turns into the game.

#2  0xb7e512df in __assert_fail () from /lib/tls/libc.so.6
#3  0x080fa928 in get_invention (pplayer=0x0, tech=199) at tech.c:59
#4  0x080fb110 in base_total_bulbs_required (pplayer=0x81fef44, tech=199)
    at tech.c:400
#5  0x080fb0d9 in total_bulbs_required (pplayer=0x81fef44) at tech.c:366
#6  0x0805dc11 in update_tech (plr=0x81fef44, bulbs=2) at techtools.c:468
#7  0x0806fb96 in update_city_activity (pplayer=0x81fef44, pcity=0x84406d0)
    at cityturn.c:1489
#8  0x0806d196 in update_city_activities (pplayer=0x81fef44) at
cityturn.c:371
#9  0x080508be in end_phase () at srv_main.c:640
#10 0x08052715 in main_loop () at srv_main.c:1701
#11 0x08052e71 in srv_loop () at srv_main.c:1962
#12 0x0805292d in srv_main () at srv_main.c:1779
#13 0x0804ae55 in main (argc=8, argv=0xbffff8b4) at civserver.c:242

-jason