I'm using yasnippet with autocomplete in auctex and it would work great if not for one detail. Whenever I create a snippet which has optional arguments, e.g. \parbox which expands to:
deleting the argument (e.g. [Height]) with Ctrl+D results in:
yas--field-probably-deleted-p: Wrong type argument: numberp, nil
Is there any way this could be fixed or debugged?