repairing clothing segfault

Describe the bug

repairing clothing with a tailor kit causes a segfault in the activity handler:

mischief@sokoban:~/Downloads/cataclysmdda-0.I $ ./cataclysm
The program has crashed.
See the log file for a stack trace.
CRASH LOG FILE: ./config/crash.log
VERSION: cdda-experimental-2024-06-02-0340 55c740a
TYPE: Signal
MESSAGE: SIGSEGV: Segmentation fault
STACK TRACE:

    0x564,f02,b71,9d1    src/debug.cpp:966    bt_full
    0x564,f02,b71,9d1    src/debug.cpp:1,231    debug_write_backtrace(std::ostream&)
    0x564,f02,b4a,41d    src/crash.cpp:89    log_crash
    0x564,f02,b4a,773    src/crash.cpp:146    signal_handler
    0x7ff,14e,c58,57f    [unknown src]:0    [unknown func]
    0x564,f02,e06,f17    src/item.cpp:936    item::is_null() const
    0x564,f02,f3c,a53    src/iuse_actor.cpp:2,916    repair_item_actor::can_repair_target(Character&, item const&, bool, bool) const
    0x564,f02,8d5,4d9    src/activity_handlers.cpp:2,505    repair_item_finish(player_activity*, Character*, bool)
    0x564,f02,902,d93    /usr/include/c++/9/bits/std_function.h:688    std::function<void (player_activity*, Character*)>::operator()(player_activity*, Character*) const
    0x564,f02,902,010    src/activity_type.cpp:167    activity_type::call_finish(player_activity*, Character*) const
    0x564,f03,40d,c73    src/player_activity.cpp:393    player_activity::do_turn(Character&)
    0x564,f02,bd5,c86    src/do_turn.cpp:531    do_turn()
    0x564,f02,70b,4f5    src/main.cpp:873    main
    0x7ff,14e,c42,c89    [unknown src]:0    [unknown func]
    0x7ff,14e,c42,d44    [unknown src]:0    [unknown func]
    0x564,f02,859,2fd    [unknown src]:0    [unknown func]
    0xf,fff,fff,fff,fff,fff    [unknown src]:0    [unknown func]
Aborted (core dumped)

Attach save file

Plainsboro-trimmed.tar.gz

Steps to reproduce

in the attached save, (a)pply tailor kit, (2) repair each work clothing, and (3) Refit or repair until success/failure/level up.

Expected behavior

not crash.

Screenshots

No response

Versions and configuration

cdda-linux-curses-x64-2024-06-02-0340.tar.gz / debian sid

Additional context

backtrace on a from source build with symbols:

gdb$ bt
#0  0x0000563cdb245c0a in item::is_null (this=0x0) at ../src/item.cpp:936
#1  0x0000563cdb3eade6 in repair_item_actor::can_repair_target (this=0x563cf2cd45a0, pl=..., fix=..., print_msg=0x1, check_consumed_available=0x1) at ../src/iuse_actor.cpp:2916
#2  0x0000563cdc113063 in repair_item_finish(player_activity*, Character*, bool) [clone .constprop.0] (act=0x563cea62e598, you=0x563cea62de80, no_menu=<optimized out>) at ../src/activity_handlers.cpp:2505
#3  0x0000563cdbb41081 in std::function<void (player_activity*, Character*)>::operator()(player_activity*, Character*) const (this=<optimized out>, __args#0=0x563cea62e598, __args#1=0x563cea62de80) at /usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/bits/std_function.h:591
#4  activity_type::call_finish (this=<optimized out>, act=0x563cea62e598, you=0x563cea62de80) at ../src/activity_type.cpp:167
#5  player_activity::do_turn (this=0x563cea62e598, you=...) at ../src/player_activity.cpp:393
#6  0x0000563cdaf48423 in do_turn () at ../src/do_turn.cpp:531
#7  0x0000563cdaa4d435 in main (argc=<optimized out>, argv=<optimized out>) at ../src/main.cpp:873

it seems that the activity target in https://github.com/CleverRaven/Cataclysm-DDA/blob/master/src/activity_handlers.cpp#L2469 somehow disappeared

CleverRaven / Cataclysm-DDA

repairing clothing segfault #74254