diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 296ddb9..09d6c9a 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -583,7 +583,10 @@
 	protected function _execute($row, $rules, $postdata = NULL, $cycles = 0)
 	{
 		// If the $_POST data is an array we will run a recursive call
-		if (is_array($postdata))
+		//
+		// Note: We MUST check if the array is empty or not!
+		//       Otherwise empty arrays will always pass validation.
+		if (is_array($postdata) && ! empty($postdata))
 		{
 			foreach ($postdata as $key => $val)
 			{