diff --git a/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php b/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php
index 958eeaeaec227..39649666ccace 100644
--- a/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php
+++ b/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php
@@ -45,6 +45,6 @@ protected function extractUsername(Request $request): ?string
throw new BadCredentialsException(sprintf('User key was not found: "%s".', $this->userKey));
}
- return $request->server->get($this->userKey);
+ return $request->server->get($this->userKey) ?: null;
}
}
diff --git a/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php b/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
index 5119f8ce09e74..b94f90884e2e0 100644
--- a/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
@@ -36,6 +36,7 @@ public function testSupportNoUser()
$authenticator = new RemoteUserAuthenticator(new InMemoryUserProvider(), new TokenStorage(), 'main');
$this->assertFalse($authenticator->supports($this->createRequest([])));
+ $this->assertFalse($authenticator->supports($this->createRequest(['REMOTE_USER' => ''])));
}
public function testSupportTokenStorageWithToken()
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