ERROR in 'mon-util.cc' at line 3199: bogus mc (no monster data): invalid monster_type 1000 (1000)

Version: Dungeon Crawl Stone Soup 0.34.1-4-g0e95e087e2
Platform: unix
Bits: 64
Game mode: normal
Tiles: online

Seed: 973607773772244092, deterministic pregen: 1
Command line: /usr/games/crawl-0.34 -name lyndar -rc /dgldir/rcfiles/crawl-0.34/lyndar.rc -macro /dgldir/rcfiles/crawl-0.34/lyndar.macro -morgue /dgldir/morgue/lyndar/ -webtiles-socket /crawl-master/webserver/sockets/lyndar:2026-09-21.00:56:24.sock -await-connection

RC options:
restart_after_game = false


Crash caused by signal #6: Aborted

Obtained 25 stack frames.
/usr/games/crawl-0.34(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x612555c8591e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-0.34(_Z13do_crash_dumpv+0x43a) [0x612555c93b7a]: do_crash_dump()
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x1fa) [0x612555c85dfa]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7383ebc42910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x7383ebc9999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x7383ebc42866]: 
/usr/games/crawl-0.34(+0x502f4d) [0x612555c92f4d]: 
/usr/games/crawl-0.34(_Z3diePKciS0_z+0x166) [0x612555c935c6]: die(char const*, int, char const*, ...)
/usr/games/crawl-0.34(_Z16mons_class_intel12monster_type+0xa3) [0x6125560d39d3]: mons_class_intel(monster_type)
/usr/games/crawl-0.34(_Z19mons_tracking_rangePK7monster+0x14) [0x61255609f204]: mons_tracking_range(monster const*)
/usr/games/crawl-0.34(_Z18mons_is_irrelevantPK7monster+0x87) [0x61255611e047]: mons_is_irrelevant(monster const*)
/usr/games/crawl-0.34(_Z12mons_is_safePK7monsterbbb+0x162) [0x61255611e252]: mons_is_safe(monster const*, bool, bool, bool)
/usr/games/crawl-0.34(_Z19notice_new_monstersRSt6vectorIP7monsterSaIS1_EES4_17seen_context_type+0x15f) [0x612556185e6f]: notice_new_monsters(std::vector<monster*, std::allocator<monster*> >&, std::vector<monster*, std::allocator<monster*> >&, seen_context_type)
/usr/games/crawl-0.34(_Z23update_monsters_in_viewv+0x1c5) [0x612556186315]: update_monsters_in_view()
/usr/games/crawl-0.34(_ZN6player17finalise_movementEPK5actor+0x45c) [0x6125561aba3c]: player::finalise_movement(actor const*)
/usr/games/crawl-0.34(_Z16floor_transition20dungeon_feature_typeS_8level_idbbbb+0xe17) [0x6125562cbea7]: floor_transition(dungeon_feature_type, dungeon_feature_type, level_id, bool, bool, bool, bool)
/usr/games/crawl-0.34(_Z11take_stairs20dungeon_feature_typebbb+0xb9) [0x6125562cdc69]: take_stairs(dungeon_feature_type, bool, bool, bool)
/usr/games/crawl-0.34(_ZN5Delay6handleEv+0x46) [0x612555cb1306]: Delay::handle()
/usr/games/crawl-0.34(_Z12handle_delayv+0x39) [0x612555cb0d89]: handle_delay()
/usr/games/crawl-0.34(+0xcc3441) [0x612556453441]: 
/usr/games/crawl-0.34(+0xcc3e25) [0x612556453e25]: 
/usr/games/crawl-0.34(main+0x1f7) [0x612555bb7317]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7383ebc280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7383ebc28189]: 
/usr/games/crawl-0.34(_start+0x25) [0x612555bb7e05]: 

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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007383ebd0fbf7 in __GI___wait4 (pid=3686460, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
#0  0x00007383ebd0fbf7 in __GI___wait4 (pid=3686460, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
        sc_ret = -512
        sc_ret = <optimized out>
#1  0x0000612555c85fcc in call_gdb (file=0x7383ebdff6c0 <_IO_2_1_stderr_>) at crash.cc:438
        gdb = <optimized out>
        attach_cmd = "attach 3685790\000\000\000\000\000"
#2  0x0000612555c93b98 in do_crash_dump () at dbg-asrt.cc:673
        t = 1789952688
        dir = "/dgldir/morgue/lyndar/"
        name = "/dgldir/morgue/lyndar/crash-lyndar-20260921-010448.txt", '\000' <repeats 125 times>
        signal_info = "Crash caused by signal #6: Aborted"
        cause_msg = "ERROR in 'mon-util.cc' at line 3199: bogus mc (no monster data): invalid monster_type 1000 (1000)"
        file = 0x7383ebdff6c0 <_IO_2_1_stderr_>
#3  0x0000612555c85dfa in crash_signal_handler (sig_num=6) at crash.cc:198
No locals.
#4  <signal handler called>
No locals.
#5  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {140721240781456}}
        ret = <optimized out>
        pd = <optimized out>
        old_mask = <optimized out>
        ret = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
        resultvar = <optimized out>
        resultvar = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
        __futex = <optimized out>
        resultvar = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
        __futex = <optimized out>
        __private = <optimized out>
        __oldval = <optimized out>
#6  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
No locals.
#7  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
No locals.
#8  0x00007383ebc42866 in __GI_raise (sig=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#9  0x0000612555c92f4d in _BreakStrToDebugger (mesg=mesg@entry=0x7ffc3791ba90 "ERROR in 'mon-util.cc' at line 3199: bogus mc (no monster data): invalid monster_type 1000 (1000)", assert=false) at dbg-asrt.cc:807
No locals.
#10 0x0000612555c935c6 in die (file=file@entry=0x6125564afcc7 "mon-util.cc", line=line@entry=3199, format=format@entry=0x61255652c600 "bogus mc (no monster data): %s (%d)") at dbg-asrt.cc:867
        tmp = "bogus mc (no monster data): invalid monster_type 1000 (1000)", '\000' <repeats 1987 times>
        mesg = "ERROR in 'mon-util.cc' at line 3199: bogus mc (no monster data): invalid monster_type 1000 (1000)", '\000' <repeats 1973 times>
        args = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7ffc3791c390, reg_save_area = 0x7ffc3791c2b0}}
#11 0x00006125560d39d3 in mons_class_intel (mc=MONS_NO_MONSTER) at /usr/include/c++/13/bits/basic_string.h:222
No locals.
#12 0x000061255609f204 in mons_tracking_range (mon=mon@entry=0x612556aa58d8 <env+267864>) at mon-pathfind.cc:38
        range = 0
#13 0x000061255611e047 in mons_is_irrelevant (mon=mon@entry=0x612556aa58d8 <env+267864>) at nearby-danger.cc:76
        mp = <error reading variable mp (value of type `monster_pathfind' requires 201664 bytes, which is more than max-value-size)>
        range = <optimized out>
#14 0x000061255611e252 in mons_is_safe (mon=mon@entry=0x612556aa58d8 <env+267864>, want_move=want_move@entry=false, consider_user_options=consider_user_options@entry=true, check_dist=check_dist@entry=true) at nearby-danger.cc:120
        dist = 68
        is_safe = <optimized out>
#15 0x0000612556185e6f in _try_seen_interrupt (sc=SC_NEWLY_SEEN, mons=...) at player-notices.cc:50
        aid =