diff --git a/symfony/console/3.3/bin/console b/symfony/console/3.3/bin/console
index 0d0ea9fb..6594b643 100755
--- a/symfony/console/3.3/bin/console
+++ b/symfony/console/3.3/bin/console
@@ -35,6 +35,6 @@ if ($_SERVER['APP_DEBUG']) {
     }
 }
 
-$kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
 $application = new Application($kernel);
 $application->run($input);
diff --git a/symfony/framework-bundle/3.3/public/index.php b/symfony/framework-bundle/3.3/public/index.php
index 9b4b36b4..b8f4d81e 100644
--- a/symfony/framework-bundle/3.3/public/index.php
+++ b/symfony/framework-bundle/3.3/public/index.php
@@ -20,7 +20,7 @@ if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? $_ENV['TRUSTED_HOSTS'] ?? false
     Request::setTrustedHosts([$trustedHosts]);
 }
 
-$kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
 $request = Request::createFromGlobals();
 $response = $kernel->handle($request);
 $response->send();
diff --git a/symfony/framework-bundle/4.2/public/index.php b/symfony/framework-bundle/4.2/public/index.php
index 9b4b36b4..b8f4d81e 100644
--- a/symfony/framework-bundle/4.2/public/index.php
+++ b/symfony/framework-bundle/4.2/public/index.php
@@ -20,7 +20,7 @@ if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? $_ENV['TRUSTED_HOSTS'] ?? false
     Request::setTrustedHosts([$trustedHosts]);
 }
 
-$kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
 $request = Request::createFromGlobals();
 $response = $kernel->handle($request);
 $response->send();