When I add a reply to a post stream in my local discourse instance, this error is thrown in the console although the new post is added to the post stream perfectly.
The error is thrown only if we submit the post before the composer saves the draft
1 Mi Piace
It seemes the errors are thrown from following codelines
https://github.com/discourse/discourse/blob/master/app/assets/javascripts/discourse/components/d-editor.js.es6#L282
3 Mi Piace
Thanks for reporting this issue. This should fix it 
https://github.com/discourse/discourse/commit/779efd923563b852ba1d135902abd3c9a0fa3e6c
5 Mi Piace
Its always a pleasure to contribute for Discourse 