1 files changed, 9 insertions, 1 deletions
diff --git a/vendor/symfony/http-foundation/HeaderBag.php b/vendor/symfony/http-foundation/HeaderBag.php
index 4f761c3bf6..7782f74244 100644
--- a/vendor/symfony/http-foundation/HeaderBag.php
+++ b/vendor/symfony/http-foundation/HeaderBag.php
@@ -121,7 +121,15 @@ class HeaderBag implements \IteratorAggregate, \Countable
         }
 
         if ($first) {
-            return \count($headers[$key]) ? (string) $headers[$key][0] : $default;
+            if (!$headers[$key]) {
+                return $default;
+            }
+
+            if (null === $headers[$key][0]) {
+                return null;
+            }
+
+            return (string) $headers[$key][0];
         }
 
         return $headers[$key];