diff --git a/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php b/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php
index 6f4390a..d960db0 100644
--- a/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -838,6 +838,10 @@ public function findDefinition($id)
      */
     private function createService(Definition $definition, $id)
     {
+        if ($definition->isSynthetic()) {
+            throw new RuntimeException(sprintf('You have requested a synthetic service ("%s"). The DIC does not know how to construct this service.', $id));
+        }
+
         $parameterBag = $this->getParameterBag();
 
         if (null !== $definition->getFile()) {