Crash on manual scan for MAME with mameinfo.dat file

Description

Using retroarch v1.9.9 and MAME (current) core (0.235), manually scanning a folder for roms and specifying the Arcade DAT file mameinfo.dat from this page retroarch crashes and no log information is generated about the crash, even if set to Debug.

Expected behavior

Retroarch should not crash and MAME playlist should be generated (ideally with the correct names).

Actual behavior

Retroarch crashes and it doesn't generate a log file that indicates any information about the crash.

Steps to reproduce the bug

1. Import content -> Manual scan
2. Content directory pointing to ROMS folder
3. System name set to "MAME"
4. Default Core set to "Arcade (MAME - Current)
5. Scan recursively and Scan inside Archives set to "ON"
6. Arcade DAT File pointing to mameinfo.dat file, downloaded from site above
7. Start scan
8. Retroarch crashes

Version/Commit

• Build Date: Sep 6 2021
• Version 1.9.9
• Git Version: 36888612eb

Environment information

• OS: Archlinux
• Compiler: GCC(11.1.0) 64-bit (installed through pacman, I didn't compile it myself)

Start by reproducing the crash with RetroArch 1.9.9, the MAME current core, and the supplied mameinfo.dat during a manual scan. Inspect the available debug output and scan behavior; done means the scan completes without crashing and generates the MAME playlist.