--- a/wp/wp-content/plugins/akismet/wrapper.php	Mon Oct 14 18:06:33 2019 +0200
+++ b/wp/wp-content/plugins/akismet/wrapper.php	Mon Oct 14 18:28:13 2019 +0200
@@ -206,7 +206,8 @@
 	return 0;
 }
 function akismet_pingback_forwarded_for( $r, $url ) {
-	return Akismet::pingback_forwarded_for( $r, $url );
+	// This functionality is now in core.
+	return false;
 }
 function akismet_pre_check_pingback( $method ) {
 	return Akismet::pre_check_pingback( $method );