diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 3536241..b490a34 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -460,6 +460,12 @@
 				$this->_field_data[$field]['postdata'] = $validation_array[$field];
 			}
 
+			// Don't try to validate if we have no rules set
+			if (empty($row['rules']))
+			{
+				continue;
+			}
+
 			$this->_execute($row, explode('|', $row['rules']), $this->_field_data[$field]['postdata']);
 		}