diff --git a/app/src/Model/Table/NotificationsTable.php b/app/src/Model/Table/NotificationsTable.php
index 6ede4b5a0..177181ae1 100644
--- a/app/src/Model/Table/NotificationsTable.php
+++ b/app/src/Model/Table/NotificationsTable.php
@@ -457,7 +457,7 @@ public function resolve(
   public function resolveFromSource(
     mixed   $source,
     string  $resolution=NotificationStatusEnum::Resolved,
-    ?int    $resolverPersonId,
+    ?int    $resolverPersonId=null,
   ) {
     $sourceUrl = $source;