So, on error (as one word) is being filtered by your word filter, this makes it annoying to post javascript based error handling in the API development subforum because its just removing it. Can you please remove this from the bad words list as it serves no purpose being there. I understand it was an attempt at securing your site years ago from XSS attacks by just blacklisting the most common method used but this does nothing to protect you any more so its pointless.
It makes it double pointless the fact you can place the onerror word inside of itself completely bypassing the filter entirely (this is annoying to do when trying to post quick codesnippits as if you edit, you forget to do it again).