diff --git a/app/auth/routes.py b/app/auth/routes.py
index b4d107c2a..8f01a0c19 100644
--- a/app/auth/routes.py
+++ b/app/auth/routes.py
@@ -95,7 +95,7 @@ def reset_password_request():
             current_app.logger.info(
                 "reset_password_request: for unkown user '{}'".format(form.email.data)
             )
-        flash(_("Voir les instructions enoyez par mail"))
+        flash(_("Voir les instructions envoyées par mail"))
         return redirect(url_for("auth.login"))
     return render_template(
         "auth/reset_password_request.html", title=_("Reset Password"), form=form
diff --git a/app/scodoc/sco_bulletins.py b/app/scodoc/sco_bulletins.py
index ab50b6bee..54e1d6752 100644
--- a/app/scodoc/sco_bulletins.py
+++ b/app/scodoc/sco_bulletins.py
@@ -444,7 +444,10 @@ def _ue_mod_bulletin(etudid, formsemestre_id, ue_id, modimpls, nt, version):
         if mod["mod_moy_txt"][:2] == "NA":
             mod["mod_moy_txt"] = "-"
         if is_malus:
-            if mod_moy > 0:
+            if isinstance(mod_moy, str):
+                mod["mod_moy_txt"] = "-"
+                mod["mod_coef_txt"] = "-"
+            elif mod_moy > 0:
                 mod["mod_moy_txt"] = scu.fmt_note(mod_moy)
                 mod["mod_coef_txt"] = "Malus"
             elif mod_moy < 0:
diff --git a/app/scodoc/sco_etud.py b/app/scodoc/sco_etud.py
index c653c007d..15fa188f1 100644
--- a/app/scodoc/sco_etud.py
+++ b/app/scodoc/sco_etud.py
@@ -440,7 +440,7 @@ def notify_etud_change(email_addr, etud, before, after, subject):
         "Civilité: " + etud["civilite_str"],
         "Nom: " + etud["nom"],
         "Prénom: " + etud["prenom"],
-        "Etudid: " + etud["etudid"],
+        "Etudid: " + str(etud["etudid"]),
         "\n",
         "Changements effectués:",
     ]
diff --git a/app/scodoc/sco_formsemestre.py b/app/scodoc/sco_formsemestre.py
index 3360b847b..3bda684a5 100644
--- a/app/scodoc/sco_formsemestre.py
+++ b/app/scodoc/sco_formsemestre.py
@@ -27,6 +27,7 @@
 
 """Operations de base sur les formsemestres
 """
+from app.scodoc.sco_exceptions import ScoValueError
 import time
 from operator import itemgetter
 
@@ -93,6 +94,10 @@ _formsemestreEditor = ndb.EditableTable(
 
 def get_formsemestre(formsemestre_id):
     "list ONE formsemestre"
+    if not isinstance(formsemestre_id, int):
+        raise ScoValueError(
+            """Semestre invalide, reprenez l'opération au départ ou si le problème persiste signalez l'erreur sur scodoc-devel@listes.univ-paris13.fr"""
+        )
     try:
         sem = do_formsemestre_list(args={"formsemestre_id": formsemestre_id})[0]
         return sem
diff --git a/app/scodoc/sco_permissions.py b/app/scodoc/sco_permissions.py
index 4eee09dab..4529e7672 100644
--- a/app/scodoc/sco_permissions.py
+++ b/app/scodoc/sco_permissions.py
@@ -45,13 +45,20 @@ class Permission(object):
     NBITS = 1  # maximum bits used (for formatting)
     ALL_PERMISSIONS = [-1]
     description = {}  # { symbol : blah blah }
+    permission_by_name = {}  # { symbol : int }
 
     @staticmethod
     def init_permissions():
         for (perm, symbol, description) in _SCO_PERMISSIONS:
             setattr(Permission, symbol, perm)
             Permission.description[symbol] = description
+            Permission.permission_by_name[symbol] = perm
         Permission.NBITS = len(_SCO_PERMISSIONS)
 
+    @staticmethod
+    def get_by_name(permission_name: str) -> int:
+        """Return permission mode (integer bit field). May raise keyError."""
+        return Permission.permission_by_name[permission_name]
+
 
 Permission.init_permissions()
diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index b897110fd..fc5138cfc 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -537,10 +537,9 @@ def sendXML(REQUEST, data, tagname=None, force_outer_xml_tag=True):
     if type(data) != list:
         data = [data]  # always list-of-dicts
     if force_outer_xml_tag:
-        root_tagname = tagname + "_list"
-        data = [{root_tagname: data}]
+        data = [{tagname: data}]
+        tagname += "_list"
     doc = sco_xml.simple_dictlist2xml(data, tagname=tagname)
-
     if REQUEST:
         REQUEST.RESPONSE.setHeader("content-type", XML_MIMETYPE)
     return doc
diff --git a/sco_version.py b/sco_version.py
index f1bee487b..2f23bcd51 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.0.19"
+SCOVERSION = "9.0.21"
 
 SCONAME = "ScoDoc"