diff --git a/src/Entity/LogSystem/ElementCreatedLogEntry.php b/src/Entity/LogSystem/ElementCreatedLogEntry.php
index 2a327e73..c78e6df0 100644
--- a/src/Entity/LogSystem/ElementCreatedLogEntry.php
+++ b/src/Entity/LogSystem/ElementCreatedLogEntry.php
@@ -54,7 +54,7 @@ class ElementCreatedLogEntry extends AbstractLogEntry implements LogWithCommentI
      */
     public function getCreationInstockValue(): ?string
     {
-        return $this->extra['i'] ?? null;
+        return isset($this->extra['i']) ? (string)$this->extra['i'] : null;
     }
 
     /**