diff --git a/feed-parsers/class-feed-parser-activitypub.php b/feed-parsers/class-feed-parser-activitypub.php
index e5413c27..be5cef7b 100644
--- a/feed-parsers/class-feed-parser-activitypub.php
+++ b/feed-parsers/class-feed-parser-activitypub.php
@@ -1722,6 +1722,9 @@ public function cache_url( $url ) {
 					$post_id = reset( $new_posts );
 				} else {
 					$post_id = Feed::url_to_postid( $url );
+					if ( is_null( $post_id ) ) {
+						$post_id = Feed::url_to_postid( $item->permalink );
+					}
 				}
 			}
 		}