diff --git a/src/Queue/FakeQueue.php b/src/Queue/FakeQueue.php
index d8d3427..a7fd25d 100644
--- a/src/Queue/FakeQueue.php
+++ b/src/Queue/FakeQueue.php
@@ -107,7 +107,7 @@ public function push(string $name, mixed $payload = [], OptionsInterface $option
     {
         $this->jobs[$name][] = [
             'name' => $name,
-            'handler' => $this->registry->getHandler($name),
+            'handler' => \class_exists($name) ? $this->registry->getHandler($name): null,
             'payload' => $payload,
             'options' => $options ?? new Options(),
         ];