Normally when I've seen this it's when you are using a variable like a normal string when in fact it's actually an array such as this example:

[Tue Mar 13 04:22:35 2018] [error] PHP Catchable fatal error:  Object of class WP_Term could not be converted to string in /vhost/httpdocs/wp-content/plugins/wp-instagram-post/classes/class-woo-igp.php on line 578


                                $tags = get_tags($post_id);
                                foreach ( $tags as $tag )
                                {
                                   $the_tags=$the_tags. "#". $tag;
                                }

With the above the $tag variable actually is an array so you would need to reference it like this $tag->name or $tag["name"];

 

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