Add support for callable form validation rules
diff --git a/system/database/drivers/mysqli/mysqli_driver.php b/system/database/drivers/mysqli/mysqli_driver.php
index 6ab3049..c5565f6 100644
--- a/system/database/drivers/mysqli/mysqli_driver.php
+++ b/system/database/drivers/mysqli/mysqli_driver.php
@@ -163,7 +163,7 @@
 	 */
 	protected function _db_set_charset($charset)
 	{
-		return @$this->conn_id->set_charset($charset);
+		return $this->conn_id->set_charset($charset);
 	}
 
 	// --------------------------------------------------------------------