diff --git a/patches.d/scribe-backend.patch b/patches.d/scribe-backend.patch
index b21ed56..170cdea 100644
--- a/patches.d/scribe-backend.patch
+++ b/patches.d/scribe-backend.patch
@@ -195,7 +195,7 @@ index 69f3411..07fa33a 100644
              Mise à niveau d'un compte enseignant
          """
 diff --git usr/lib/python3/dist-packages/scribe/eoleldap.py usr/lib/python3/dist-packages/scribe/eoleldap.py
-index 45ec338..dac52b3 100644
+index 45ec338..a3054ee 100644
 --- usr/lib/python3/dist-packages/scribe/eoleldap.py
 +++ usr/lib/python3/dist-packages/scribe/eoleldap.py
 @@ -8,21 +8,21 @@
@@ -257,41 +257,60 @@ index 45ec338..dac52b3 100644
          users = []
          res = self.ldap_admin._search("(&%s%s)" % (USER_FILTER, filtre), attrs)
          for user in res:
-@@ -572,21 +570,31 @@ elif LDAP_MODE == 'openldap':
+@@ -566,27 +564,47 @@ elif LDAP_MODE == 'openldap':
+                 ret.append((key, sub))
+             return ret
+ 
+     class LdapEntry(_LdapEntry):
+         def _get_etab(self, _type, name, ldap_filter, attr, multi_etabs=False):
+             """
                  récupère le numéro d'etab du cache ou requète LDAP
              """
              if not SUPPORT_ETAB:
                  return None
++
              if not multi_etabs and name in self.cache_etab[_type]:
                  return self.cache_etab[_type][name]
++            
              need_close = False
-             if self.ldap_admin.connexion == None:
+-            if self.ldap_admin.connexion == None:
++            if self.ldap_admin.connexion is None:
                  self.ldap_admin.connect()
                  need_close = True
 -            dn = self.ldap_admin._search(ldap_filter, [attr])[0][0]
-+            try:
-+                if _type == 'group':
-+                    attr = 'cn'
-+                result = self.ldap_admin._search(ldap_filter, [attr])[0]
-+                if _type == 'login':
-+                    etab = [cn[1]['cn'][0] for cn in self.ldap_admin._search(f'(&(objectClass=eolegroupe)(type=Etablissement)(memberUid={name}))', ['cn'])]
-+                    if not etab:
-+                        return None
-+                else:
-+                    etab = [result[0].split(',ou=')[-3]]
-+                if not multi_etabs:
-+                    etab = etab[0]
-+            except:
-+                etab = None
-             if need_close:
-                 self.ldap_admin.close()
+-            if need_close:
+-                self.ldap_admin.close()
 -            etab = dn.split(',ou=')[-3]
 -            if multi_etabs:
 -                etab = [etab]
 -            else:
++            
++            try:
++                if _type == 'login':
++                    etab = [cn[1]['cn'][0] for cn in self.ldap_admin._search(f'(&(objectClass=eolegroupe)(type=Etablissement)(memberUid={name}))', ['cn'])]
++                else:
++                    if _type == 'group':
++                        attr = 'cn'
++                    result = self.ldap_admin._search(ldap_filter, [attr])[0]
++                    etab = [result[0].split(',ou=')[-3]]
++
++                if not multi_etabs:
++                    if len(etab) == 0:
++                        etab = None
++                    else:
++                        etab = etab[0]
++                    
++            except BaseException:
++                etab = None
++            finally:
++                if need_close:
++                    self.ldap_admin.close()
++
 +            if not multi_etabs:
                  self.cache_etab[_type][name] = etab
++
              return etab
++
  else:
      raise Exception('Unknown mode')
 diff --git usr/lib/python3/dist-packages/scribe/eoleuser.py usr/lib/python3/dist-packages/scribe/eoleuser.py