[Freeciv-Dev] (PR#14630) crash when investigating hut

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=14630 >

#0  0x080b9753 in city_can_be_built_here (ptile=0x894a3d8, punit=0x0)
     at city.c:756
756       if (ptile->owner && ptile->owner != punit->owner) {
(gdb) bt
#0  0x080b9753 in city_can_be_built_here (ptile=0x894a3d8, punit=0x0)
     at city.c:756
#1  0x08066382 in hut_get_city (punit=0x8a16a68) at unittools.c:2221
#2  0x08066618 in unit_enter_hut (punit=0x8a16a68) at unittools.c:2290
#3  0x08067ed7 in move_unit (punit=0x8a16a68, pdesttile=0x894a3d8, 
move_cost=1)
     at unittools.c:2852
#4  0x080acd58 in handle_unit_move_request (punit=0x8a16a68,
     pdesttile=0x894a3d8, igzoc=false, move_diplomat_city=false)
     at unithand.c:1150
#5  0x081342da in ai_unit_attack (punit=0x8a16a68, ptile=0x894a3d8)
     at aitools.c:951
#6  0x08132999 in ai_unit_execute_path (punit=0x8a16a68, path=0x898c9f0)
     at aitools.c:191
#7  0x0813310f in ai_follow_path (punit=0x8a16a68, path=0x898c9f0,
     ptile=0x894a3d8) at aitools.c:380
#8  0x081333bb in ai_unit_goto_constrained (punit=0x8a16a68, 
ptile=0x894a3d8,
     parameter=0xbfa42320) at aitools.c:454
#9  0x08133cac in ai_unit_goto (punit=0x8a16a68, ptile=0x894a3d8)
     at aitools.c:785
#10 0x08128214 in ai_manage_explorer (punit=0x8a16a68) at aiexplorer.c:345
#11 0x08139c4c in ai_manage_unit (pplayer=0x82a26b8, punit=0x8a16a68)
     at aiunit.c:2163
#12 0x0813a041 in ai_manage_units (pplayer=0x82a26b8) at aiunit.c:2256
#13 0x0812bc94 in ai_do_first_activities (pplayer=0x82a26b8) at aihand.c:427
#14 0x08050d48 in ai_start_phase () at srv_main.c:449
#15 0x0805115a in begin_phase (is_new_phase=true) at srv_main.c:570
#16 0x08052f4f in main_loop () at srv_main.c:1557
#17 0x080538b9 in srv_loop () at srv_main.c:1887
#18 0x080531dc in srv_main () at srv_main.c:1687
#19 0x0804af89 in main (argc=1, argv=0xbfa426e4) at civserver.c:242