minor #16416 [Security][Guard] Check whether $this->logger is not null on GuardAuthenticationListener (aeoris, Diego Agulló)

This PR was merged into the 2.8 branch.

Discussion
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[Security][Guard] Check whether $this->logger is not null on GuardAuthenticationListener

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |  yes
| Fixed tickets | #16415
| License       | MIT
| Doc PR        |

Commits
-------

ebc751d Write the log message on a single line againn
713b99f Check whether $this->logger is not null on GuardAuthenticationListener

1 files changed, 3 insertions, 1 deletions

diff --git a/Guard/Firewall/GuardAuthenticationListener.php b/Guard/Firewall/GuardAuthenticationListener.php
index 0ac7c12..ed0a36e 100644
--- a/Guard/Firewall/GuardAuthenticationListener.php
+++ b/Guard/Firewall/GuardAuthenticationListener.php
@@ -77,7 +77,9 @@ class GuardAuthenticationListener implements ListenerInterface
             $this->executeGuardAuthenticator($uniqueGuardKey, $guardAuthenticator, $event);
 
             if ($event->hasResponse()) {
-                $this->logger->debug(sprintf('The "%s" authenticator set the response. Any later authenticator will not be called', get_class($guardAuthenticator)));
+                if (null !== $this->logger) {
+                    $this->logger->debug(sprintf('The "%s" authenticator set the response. Any later authenticator will not be called', get_class($guardAuthenticator)));
+                }
 
                 break;
             }