1 files changed, 7 insertions, 0 deletions
diff --git a/Http/Firewall/ContextListener.php b/Http/Firewall/ContextListener.php
index 865cc04..452bf1d 100644
--- a/Http/Firewall/ContextListener.php
+++ b/Http/Firewall/ContextListener.php
@@ -22,6 +22,7 @@ use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\SecurityContext;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
@@ -43,6 +44,12 @@ class ContextListener implements ListenerInterface
             throw new \InvalidArgumentException('$contextKey must not be empty.');
         }
 
+        foreach ($userProviders as $userProvider) {
+            if (!$userProvider instanceof UserProviderInterface) {
+                throw new \InvalidArgumentException(sprintf('User provider "%s" must implement "Symfony\Component\Security\Core\User\UserProviderInterface".', get_class($userProvider)));
+            }
+        }
+
         $this->context = $context;
         $this->userProviders = $userProviders;
         $this->contextKey = $contextKey;