Get this crash on last Testing PPA build:

(gdb) where
#0  0x00007ffff25fd0a1 in __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
#1  0x00005555556649da in string_list_new_special (type=STRING_LIST_MIDI_DRIVERS, data=0x0, len=0x7fffffffb3ec, list_size=0x7fffffffb3f0) at list_special.c:276
#2  0x0000555555664cc4 in char_list_new_special (type=STRING_LIST_MIDI_DRIVERS, data=0x0) at list_special.c:345
#3  0x00005555556940c2 in config_get_midi_driver_options () at configuration.c:1117
#4  0x00005555558d6acd in setting_append_list (type=SETTINGS_LIST_DRIVERS, list=0x7fffffffb890, list_info=0x555556f4aaa0, parent_group=0x555555d7430e "settings") at menu/menu_setting.c:7290
#5  0x00005555558fb716 in menu_setting_new_internal (list_info=0x555556f4aaa0) at menu/menu_setting.c:14872
#6  0x00005555558fb8ce in menu_setting_new () at menu/menu_setting.c:14924
#7  0x00005555558fba22 in menu_setting_ctl (state=MENU_SETTING_CTL_NEW, data=0x5555562fb440 <menu_entries_list_settings>) at menu/menu_setting.c:14971
#8  0x00005555558c4b6e in menu_entries_ctl (state=MENU_ENTRIES_CTL_SETTINGS_INIT, data=0x0) at menu/menu_entries.c:1256
#9  0x00005555558c4135 in menu_entries_init () at menu/menu_entries.c:986
#10 0x00005555558c4cb0 in menu_entries_ctl (state=MENU_ENTRIES_CTL_INIT, data=0x0) at menu/menu_entries.c:1317
#11 0x00005555558bdba2 in menu_init (menu_data=0x55555757f040) at menu/menu_driver.c:1842
#12 0x00005555558be5c8 in menu_driver_init_internal (video_is_threaded=false) at menu/menu_driver.c:2200
#13 0x00005555558be6c0 in menu_driver_init (video_is_threaded=false) at menu/menu_driver.c:2228
#14 0x000055555562fccb in drivers_init (flags=1023) at retroarch.c:11356
#15 0x000055555563247d in retroarch_main_init (argc=1, argv=0x7fffffffd228) at retroarch.c:12765
#16 0x0000555555653df1 in content_load (info=0x7fffffffd0f0) at tasks/task_content.c:289
#17 0x0000555555655180 in task_load_content (content_info=0x7fffffffd0f0, content_ctx=0x7fffffffd010, launched_from_menu=true, launched_from_cli=true, error_string=0x7fffffffcfe8)
    at tasks/task_content.c:981
#18 0x0000555555656a5d in task_load_content_callback (content_info=0x7fffffffd0f0, loading_from_menu=true, loading_from_cli=true) at tasks/task_content.c:1714
#19 0x0000555555656c88 in task_push_load_content_from_cli (core_path=0x0, fullpath=0x0, content_info=0x7fffffffd0f0, type=CORE_TYPE_PLAIN, cb=0x0, user_data=0x0)
    at tasks/task_content.c:1792
#20 0x000055555561a7bd in rarch_main (argc=1, argv=0x7fffffffd228, data=0x0) at frontend/frontend.c:139
#21 0x00005555557968fd in main(int, char**) (argc=1, argv=0x7fffffffd228) at ui/drivers/qt/ui_qt_application.cpp:188