Fix issue #1925 (order_by() with  = FALSE)
diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
index 0eb5a9e..a6e6e59 100644
--- a/system/database/DB_query_builder.php
+++ b/system/database/DB_query_builder.php
@@ -975,7 +975,7 @@
 
 		if ($escape === FALSE)
 		{
-			$qb_orderby[] = array(array('field' => $orderby, 'direction' => $direction, $escape => FALSE));
+			$qb_orderby[] = array('field' => $orderby, 'direction' => $direction, 'escape' => FALSE);
 		}
 		else
 		{