diff --git a/HttpServer/Http/HttpHeaders.php b/HttpServer/Http/HttpHeaders.php
index a7176122..5e24d945 100644
--- a/HttpServer/Http/HttpHeaders.php
+++ b/HttpServer/Http/HttpHeaders.php
@@ -62,7 +62,7 @@ class HttpHeaders
 	 */
 	public function getContentType(): string
 	{
-        return $this->_headers['content-type'];
+        return $this->_headers['content-type'] ?? '';
 	}