diff --git a/api/src/Service/SynchronizationService.php b/api/src/Service/SynchronizationService.php
index 956e6a91f..0f9e2dcf6 100644
--- a/api/src/Service/SynchronizationService.php
+++ b/api/src/Service/SynchronizationService.php
@@ -1523,6 +1523,10 @@ public function aquireObject(string $url, Entity $entity): ?ObjectEntity
      */
     public function getSourceId(?string &$endpoint, ?string $url = null): ?string
     {
+        if ($endpoint === null) {
+            return $url;
+        }
+
         $explodedEndpoint = explode('/', $endpoint);
         $sourceId = end($explodedEndpoint);
         if (Uuid::isValid($sourceId) === true || is_int((int) $sourceId) === true) {