Fatal error: Cannot use object of type stdClass as array in /.../wp-includes/post.php on line 1202

[jmaimarc]

It's checking against empty() in the second half of the if() statement which can only be strings, integers, floats, NULL, TRUE/FALSE, arrays or variables.

The function get_post_type_labels() is passing a stdClass object into _get_custom_object_labels( $object, $nohier_vs_hier_defaults ).

$pt = get_post_type(); returns string into $pt
$obj = get_post_type_object($pt); returns object into $obj
$posttype = get_post_type_labels($obj); returns ERROR

[scribu]

Similar: #16310

[nacin]

Looks like a duplicate. Please note my comments there: The get_post_type_labels() function was not designed as a public function.