If you built the game with Godot 4.4 it's almost guaranteed to be https://github.com/godotengine/godot/issues/107390—I'm on a Mac and almost all web exports from that version of Godot will crash for those of us affected when the audio playback type is set to sample mode instead of stream mode. They merged the fix though and it looks like it'll be in Godot 4.5!