diff --git a/src/Resources/config/services.yaml b/src/Resources/config/services.yaml
index 2ee5a37..d50ba83 100644
--- a/src/Resources/config/services.yaml
+++ b/src/Resources/config/services.yaml
@@ -1,5 +1,5 @@
 parameters:
-  unleash.bundle.version: '0.11.3'
+  unleash.bundle.version: '0.12.0'
 
 services:
 
@@ -143,6 +143,8 @@ services:
       - '@unleash.client.configuration'
       - '@unleash.client.metrics_handler'
       - '@unleash.client.variant_handler'
+    tags:
+      - {name: routing.condition_service, alias: 'unleash'}
 
   unleash.client.is_enabled_attribute_listener:
     class: Unleash\Client\Bundle\Listener\ControllerAttributeResolver
diff --git a/src/Twig/FeatureTagTokenParser.php b/src/Twig/FeatureTagTokenParser.php
index 37cbdeb..2ad4594 100644
--- a/src/Twig/FeatureTagTokenParser.php
+++ b/src/Twig/FeatureTagTokenParser.php
@@ -22,6 +22,8 @@ public function parse(Token $token): Node
         $stream->expect(Token::NAME_TYPE, 'endfeature');
         $stream->expect(Token::BLOCK_END_TYPE);
 
+        assert(is_string($featureName));
+
         return new FeatureTagNode($featureName, $body, $token->getLine(), $this->getTag(), $this->extensionClass);
     }