1 files changed, 6 insertions, 5 deletions
diff --git a/Http/Firewall/SimplePreAuthenticationListener.php b/Http/Firewall/SimplePreAuthenticationListener.php
index 47996b2..a6f4f77 100644
--- a/Http/Firewall/SimplePreAuthenticationListener.php
+++ b/Http/Firewall/SimplePreAuthenticationListener.php
@@ -21,7 +21,6 @@ use Symfony\Component\Security\Core\Authentication\Token\AnonymousToken;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
 use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * SimplePreAuthenticationListener implements simple proxying to an authenticator.
@@ -76,13 +75,15 @@ class SimplePreAuthenticationListener implements ListenerInterface
         }
 
         try {
-            $this->securityContext->setToken(null);
             $token = $this->simpleAuthenticator->createToken($request, $this->providerKey);
 
-            if ($token instanceof TokenInterface) {
-                $token = $this->authenticationManager->authenticate($token);
-                $this->securityContext->setToken($token);
+            // allow null to be returned to skip authentication
+            if (null === $token) {
+                return;
             }
+
+            $token = $this->authenticationManager->authenticate($token);
+            $this->securityContext->setToken($token);
         } catch (AuthenticationException $e) {
             $this->securityContext->setToken(null);