diff --git a/src/Valitron/Validator.php b/src/Valitron/Validator.php
index 5fc5c84..f6bd446 100644
--- a/src/Valitron/Validator.php
+++ b/src/Valitron/Validator.php
@@ -565,6 +565,9 @@ class Validator
      */
     protected function validateSlug($field, $value)
     {
+        if(is_array($value)) {
+            return false;
+        }
         return preg_match('/^([-a-z0-9_-])+$/i', $value);
     }
 
diff --git a/tests/Valitron/ValidateTest.php b/tests/Valitron/ValidateTest.php
index 490424e..0bd0754 100644
--- a/tests/Valitron/ValidateTest.php
+++ b/tests/Valitron/ValidateTest.php
@@ -616,6 +616,13 @@ class ValidateTest extends BaseTestCase
         $v->rule('slug', 'test');
         $this->assertFalse($v->validate());
     }
+    
+    public function testNoErrorFailOnArray()
+    {
+        $v = new Validator(array('test' => array()));
+        $v->rule('slug', 'test');
+        $this->assertFalse($v->validate());
+    }
 
     public function testRegexValid()
     {