Segfault related to fields

[CIB]

Program received signal SIGSEGV, Segmentation fault.
field_entry::getFieldType (this=0x6e656e6f) at field.cpp:1481
1481 return type;
(gdb) backtrace full
#0 field_entry::getFieldType (this=0x6e656e6f) at field.cpp:1481

No locals.
#1 0x08086817 in map::mon_in_field (this=0xb6ad1ec4, x=112, y=47, g=0xb6acf008, z=0x99a2400) at field.cpp:1193

    dam = 0
    field_list_it = 
    curfield = @0x995ec1c: {field_list = std::vector of length 0, capacity 1, draw_symbol = fd_null, dirty = false}
    cur = 0x6e656e6f

#2 0x08a5d4fc in game::monmove (this=0xb6acf008) at game.cpp:4319

    i = 4

#3 0x08a53ef7 in game::do_turn (this=0xb6acf008) at game.cpp:596

No locals.
#4 0x08b2b1b1 in main (argc=0, argv=0xbffff998) at main.cpp:96

    seed = 1374756019
    quit_game = false
    delete_world = false
    sigIntHandler = {__sigaction_handler = {sa_handler = 0x8b2b290 <exit_handler(int)>, sa_sigaction = 0x8b2b290 <exit_handler(int)>}, sa_mask = {
        __val = {0 <repeats 32 times>}}, sa_flags = 0, sa_restorer = 0x1}

[CIB]

I'm closing this for now because it only happens with a specific save, and that might just be savegame incompatability. Still, if someone complains about segfaults with nearby fires, this might be it.