diff --git a/code/ZenValidatorConstraint.php b/code/ZenValidatorConstraint.php
index b6bc3fa..7cda442 100644
--- a/code/ZenValidatorConstraint.php
+++ b/code/ZenValidatorConstraint.php
@@ -379,7 +379,12 @@ public function removeParsley()
 
     public function validate($value)
     {
-        $array = array_filter(explode(',', $value));
+        if (is_string($value)) {
+            $array = array_filter(explode(',', $value));
+        } else {
+            $array = $value;
+        }
+        
         if (empty($array)) {
             return; //you should use required instead
         }