diff --git a/language/oop5/decon.xml b/language/oop5/decon.xml
index d2aa586b0df0..ee83e45ebe2b 100644
--- a/language/oop5/decon.xml
+++ b/language/oop5/decon.xml
@@ -252,7 +252,7 @@ class Product {
     }
 
     public static function fromJson(string $json): static {
-        $data = json_decode($json);
+        $data = json_decode($json, true);
         return new static($data['id'], $data['name']);
     }