diff --git a/onyx/include/common/Exercice.class.php b/onyx/include/common/Exercice.class.php
index 8d8bf053..48010ae2 100644
--- a/onyx/include/common/Exercice.class.php
+++ b/onyx/include/common/Exercice.class.php
@@ -135,12 +135,14 @@ class Exercice
       do
       {
         array_push($checked, $exo);
-        $res = $db->unique_query("SELECT `require` FROM exercices WHERE id = ".intval($exo));
+        $res = $db->unique_query("SELECT `require` FROM exercices WHERE id = ".$exo);
         $exo = $res['require'];
         $ret++;
       } while ($exo != "" && !in_array($exo, $checked));
 
       $this->number = $ret;
+
+      $db->deconnexion();
   }
 
   function update($create)