that is a known bug, but i don't have a good solution for it
it's because the detectors' enter and exit signals are not emitted in the same chronological way, so there's a chance that enter is done before exit
i love the gameplay and really want to squish the main character
i also got this error right after the opening cutscene in the browser version, but the audio kicked back in like half a minute later
i also am not sure if there was meant to be more of an ending, for me it just abruptly cut to the "Thank you for playing <3" screen