I'm not sure it will help, I've found the stack trace in browser's console.
Godot https://html-classic.itch.zone/html/14530547/index.js:9 callMain https://html-classic.itch.zone/html/14530547/index.js:35 Engine https://html-classic.itch.zone/html/14530547/index.js:827 Engine https://html-classic.itch.zone/html/14530547/index.js:822 index.html:139:11 displayFailureNotice https://html-classic.itch.zone/html/14530547/index.html:139