Notice: Trying to get property 'SENTENCE' of non-object in /var/www/html/ao/wp-content/themes/ao/page-suggest-sentence-audio.php on line 21

Update or Suggest media for "
Notice: Trying to get property 'SENTENCE' of non-object in /var/www/html/ao/wp-content/themes/ao/page-suggest-sentence-audio.php on line 22
"