Ticket #43666: 43666.patch

wordpress-importer.php

@@ -825 +825 @@
                                                 if ( ! $value )
                                                         $value = maybe_unserialize( $meta['value'] );
 
-                                                add_post_meta( $post_id, $key, $value );
+                                                if ( ! add_post_meta( $post_id, $key, $value, true ) ) { 
+                                                   update_post_meta( $post_id, $key, $value );
+                                                }
                                                 do_action( 'import_post_meta', $post_id, $key, $value );
 
                                                 // if the post has a featured image, take note of this in case of remap