Ticket #17413: 17413.2.diff

Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php      (revision 17913)
+++ wp-admin/includes/template.php      (working copy)
@@ -323,6 +323,8 @@
  * @param unknown_type $mode
  */
 function wp_comment_reply($position = '1', $checkbox = false, $mode = 'single', $table_row = true) {
+       global $wp_list_table;
+
        // allow plugin to replace the popup content
        $content = apply_filters( 'wp_comment_reply', '', array('position' => $position, 'checkbox' => $checkbox, 'mode' => $mode) );
 
@@ -331,10 +333,12 @@
                return;
        }
 
-       if ( $mode == 'single' ) {
-               $wp_list_table = _get_list_table('WP_Post_Comments_List_Table');
-       } else {
-               $wp_list_table = _get_list_table('WP_Comments_List_Table');
+       if ( ! ( is_object( $wp_list_table ) && is_a( $wp_list_table, 'WP_Comments_List_Table' ) ) ) {
+               if ( $mode == 'single' ) {
+                       $wp_list_table = _get_list_table('WP_Post_Comments_List_Table');
+               } else {
+                       $wp_list_table = _get_list_table('WP_Comments_List_Table');
+               }
        }
 
 ?>
@@ -1742,7 +1746,7 @@
 
        if ( !empty($wp_current_screen_options) )
                $show_screen = true;
-               
+
        $show_screen = apply_filters('screen_options_show_screen', $show_screen, $screen);
 
 ?>