Ticket #57923: 57923.diff

src/wp-includes/taxonomy.php

@@ -2711 +2711 @@
  * @param int              $object_id The object to relate to.
  * @param string|int|array $terms     A single term slug, single term ID, or array of either term slugs or IDs.
  *                                    Will replace all existing related terms in this taxonomy. Passing an
- *                                    empty value will remove all related terms.
+ *                                    empty array will remove all related terms.
  * @param string           $taxonomy  The context in which to relate the term to the object.
  * @param bool             $append    Optional. If false will delete difference of terms. Default false.
  * @return array|WP_Error Term taxonomy IDs of the affected terms or WP_Error on failure.
@@ -2725 +2725 @@
                 return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
         }
 
+        if ( empty( $terms ) ) {
+                $terms = array();
+        }
+
         if ( ! is_array( $terms ) ) {
                 $terms = array( $terms );
         }