[Security][Http][SwitchUserListener] Ignore all non existent username protection errors

Author: fancyweb

Firewall/SwitchUserListener.php

@@ -168,7 +168,7 @@ private function attemptSwitchUser(Request $request, string $username): ?TokenIn
 
             try {
                 $this->provider->loadUserByUsername($nonExistentUsername);
-            } catch (AuthenticationException $e) {
+            } catch (\Exception $e) {
             }
         } catch (AuthenticationException $e) {
             $this->provider->loadUserByUsername($currentUsername);