If you tick “pause on caught extensions”, the debugger will pause when this error happens and you will be able to click through the previous items on the Call Stack to see which function it was going over when this happens.
However, I have just re-downloaded the latest YYMPS from Itch, imported it into a new project, and that works fine:
Entering main loop... test23.js:85325:47
[GMLive][28/09/2025 22:26:36] GMLive.gml v1.0.76 for GM2022+
[GMLive][28/09/2025 22:26:36] Initializing...
[GMLive][28/09/2025 22:26:36] Indexing assets...
[GMLive][28/09/2025 22:26:36] Indexed OK!
Audio Engine => Loading
[GMLive][28/09/2025 22:26:36] Trying to connect to gmlive-server...
Application Surface created: w=640, h=360
Audio Engine => Suspended
[GMLive][28/09/2025 22:26:36] Ready!
Are you sure that you are on the current version of GMLive? Based on your gmlive-server build date, it seems that you are on 2024.2 minifix from March last year, and I have to fix something related to HTML5 support after every other GM update.