Ticket #5330: wp-import-numeric-tag-fix-r6324.patch

wordpress/wp-admin/import/wordpress.php

@@ -396 +396 @@
                                                 $tag_id = wp_insert_term($tag, 'post_tag');
                                                 $tag_id = $tag_id['term_id'];
                                         }
-                                        $post_tags[] = $tag_id;
+                                        $post_tags[] = intval($tag_id);
                                 }
                                 wp_set_post_tags($post_id, $post_tags);
                         }