diff --git a/composer.json b/composer.json
index 05a02402..7eaefb12 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.5.0",
-        "symfony/var-dumper": "^3.4 || ^4.0 || ^5.0 || ^6.0"
+        "symfony/var-dumper": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0"
     },
     "require-dev": {
         "cebe/markdown": "^1.1",
diff --git a/src/Phug/Renderer/Renderer/Partial/Debug/DebuggerTrait.php b/src/Phug/Renderer/Renderer/Partial/Debug/DebuggerTrait.php
index 42a69d84..b67f14bb 100644
--- a/src/Phug/Renderer/Renderer/Partial/Debug/DebuggerTrait.php
+++ b/src/Phug/Renderer/Renderer/Partial/Debug/DebuggerTrait.php
@@ -229,6 +229,7 @@ private function isStdOutATTY()
             }
 
             $stat = @fstat(STDOUT);
+
             // Check if formatted mode is S_IFCHR
             return $stat ? 0020000 === ($stat['mode'] & 0170000) : false;
         }
diff --git a/src/Phug/Util/Util/SandBox.php b/src/Phug/Util/Util/SandBox.php
index fccbe5f8..2ae952af 100644
--- a/src/Phug/Util/Util/SandBox.php
+++ b/src/Phug/Util/Util/SandBox.php
@@ -33,6 +33,7 @@ public function __construct(callable $action, callable $errorInterceptor = null)
             return false;
         });
         ob_start();
+
         // @codeCoverageIgnoreStart
         try {
             $this->result = $action();