diff --git a/src/Scope.php b/src/Scope.php
index 45037b66..c2fc08f0 100644
--- a/src/Scope.php
+++ b/src/Scope.php
@@ -343,13 +343,17 @@ protected function serializeResource(Serializer $serializer, $data): ?array
      *
      * @internal
      *
-     * @param TransformerAbstract|callable $transformer
-     * @param mixed                        $data
+     * @param TransformerAbstract|callable|null $transformer
+     * @param mixed                             $data
      */
     protected function fireTransformer($transformer, $data): array
     {
         $includedData = [];
 
+        if ($transformer === null) {
+            return [$data, $includedData];
+        }
+
         if (is_callable($transformer)) {
             $transformedData = call_user_func($transformer, $data);
         } else {