diff --git a/DatabaseMysql.php b/DatabaseMysql.php
index c58f44a..8511efe 100644
--- a/DatabaseMysql.php
+++ b/DatabaseMysql.php
@@ -114,6 +114,7 @@ class DatabaseMysql implements Database
         }
         else
         {
+            $this->transactions = array();
             $this->link->set_charset('utf8');
             if ($this->autoBegin)
             {
@@ -349,6 +350,7 @@ class DatabaseMysql implements Database
             {
                 if (!$v)
                 {
+                    // FIXME: It seems we should return empty result in that case
                     throw new DatabaseException("Error: empty array for '$k IN (...)', don't know what to do");
                 }
                 else