diff --git a/src/Cookie.php b/src/Cookie.php
index ecfbcda..5e2f8e6 100644
--- a/src/Cookie.php
+++ b/src/Cookie.php
@@ -511,7 +511,10 @@ private function normalizeDomain($domain)
      */
     private function normalizePath($path)
     {
-        $path = rtrim($path, '/');
+        if(null !== $path)
+        {
+         $path = rtrim($path, '/');
+        }
 
         if (empty($path) or '/' !== substr($path, 0, 1)) {
             $path = '/';