Ticket #44162: 44162.diff

src/wp-admin/edit-form-advanced.php

@@ -28 +28 @@
                 )
         );
 
-        if ( count( $check_users ) > 1 ) {
+        if ( is_countable( $check_users ) && count( $check_users ) > 1 ) {
                 add_action( 'admin_footer', '_admin_notice_post_locked' );
         }
 
@@ -249 +249 @@
         $revisions = wp_get_post_revisions( $post_ID );
 
         // We should aim to show the revisions meta box only when there are revisions.
-        if ( count( $revisions ) > 1 ) {
+        if ( is_countable( $revisions ) && count( $revisions ) > 1 ) {
                 reset( $revisions ); // Reset pointer for key()
                 $publish_callback_args = array(
                         'revisions_count' => count( $revisions ),
@@ -294 +294 @@
         add_meta_box( $tax_meta_box_id, $label, $taxonomy->meta_box_cb, null, 'side', 'core', array( 'taxonomy' => $tax_name ) );
 }
 
-if ( post_type_supports( $post_type, 'page-attributes' ) || count( get_page_templates( $post ) ) > 0 ) {
+if ( post_type_supports( $post_type, 'page-attributes' ) || ( is_countable( get_page_templates( $post ) ) && count( get_page_templates( $post ) ) > 0 ) ) {
         add_meta_box( 'pageparentdiv', $post_type_object->labels->attributes, 'page_attributes_meta_box', null, 'side', 'core' );
 }