You just have to update/insert the detectError/evalPlugin/evalSnippet functions in document parser class.
This is mainly a fix for an error occuring with runSnippet function in an @EVAL binding in a template variable during creating/saving a new ressource. In that case E_NOTICE was not filtered even if it was excluded in system setting 'detection level of PHP errors'.
It does not fix your snippet saving issue, since the fix is not for that problem. Don't know what issue is happening on your installation. So please tell a bit more what you try to do, what error occurs.
And please open a new thread for that.