id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 44304,API will create PHP warning and thus break code on empty category,apermo,,"Example Request {{{ array (size=3) 'headers' => array (size=) 'Authorization' => string 'Basic randomstring==' (length=34) 'body' => array (size=15) 'title' => string 'Test' (length=4) 'status' => string 'publish' (length=7) 'content' => string '' (length=0) 'date' => string '2018-06-04 17:11:32' (length=19) 'date_gmt' => string '2018-06-04 15:11:32' (length=19) 'modified' => string '2018-06-05 10:24:01' (length=19) 'modified_gmt' => string '2018-06-05 08:24:01' (length=19) 'excerpt' => string '' (length=0) 'slug' => string 'test' (length=4) 'type' => string 'post' (length=4) 'comment_status' => string 'closed' (length=6) 'ping_status' => string 'closed' (length=6) 'sticky' => boolean false 'categories' => string '' (length=0) 'tags' => string '' (length=0) 'method' => string 'POST' (length=4) }}} This will lead to warnings when Debug is active on the remote node. Warning: Invalid argument supplied for foreach() in /path/to/public_html/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php on line 1256 I suggest to replace (1251-1253): {{{#!php