diff --git a/src/wp-includes/post.php b/src/wp-includes/post.php
index ddd73bc737..81b5d76c44 100644
--- a/src/wp-includes/post.php
+++ b/src/wp-includes/post.php
@@ -1473,6 +1473,8 @@ function _post_type_meta_capabilities( $capabilities = null ) {
  * Above, the first default value is for non-hierarchical post types (like posts) and the second one is for hierarchical post types (like pages).
  *
  * @since 3.0.0
+ * @access private
+ *
  * @param object $post_type_object
  * @return object object with all the labels as member variables
  */
@@ -1506,6 +1508,7 @@ function get_post_type_labels( $post_type_object ) {
  * @since 3.0.0
  */
 function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
+	$object->labels = (array) $object->labels;
 
 	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
 		$object->labels['name'] = $object->label;
diff --git a/src/wp-includes/taxonomy.php b/src/wp-includes/taxonomy.php
index 8e1898e29f..acb8517ce7 100644
--- a/src/wp-includes/taxonomy.php
+++ b/src/wp-includes/taxonomy.php
@@ -438,6 +438,8 @@ function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
  */
 
 function get_taxonomy_labels( $tax ) {
+	$tax->labels = (array) $tax->labels;
+
 	if ( isset( $tax->helps ) && empty( $tax->labels['separate_items_with_commas'] ) )
 		$tax->labels['separate_items_with_commas'] = $tax->helps;