I saw this on the Quota demo site. When you view the blog, there are two warnings thrown:
[08-Nov-2016 16:10:33 UTC] PHP Warning: Illegal string offset 'width' in /dom8333/wp-content/themes/quota/templates/content-image.php on line 18
[08-Nov-2016 16:10:33 UTC] PHP Warning: Illegal string offset 'height' in /dom8333/wp-content/themes/quota/templates/content-image.php on line 19
From initial thoughts, it seems like we are looking for a featured image but when one doesn't exist we're not checking some indexes. Just need to throw some empty
checks around those if possible.