diff --git a/src/Illuminate/Support/Str.php b/src/Illuminate/Support/Str.php
index bd54885d9d1b..8b4ef40901d7 100644
--- a/src/Illuminate/Support/Str.php
+++ b/src/Illuminate/Support/Str.php
@@ -179,12 +179,13 @@ public static function camel($value)
      */
     public static function contains($haystack, $needles)
     {
-        foreach ((array) $needles as $needle) {
-            if ($needle !== '' && mb_strpos($haystack, $needle) !== false) {
-                return true;
+        if($haystack !== null && is_string($haystack)){
+            foreach ((array) $needles as $needle) {
+                if ($needle !== '' && mb_strpos($haystack, $needle) !== false) {
+                    return true;
+                }
             }
         }
-
         return false;
     }