diff --git a/apps/note/models/transactions.py b/apps/note/models/transactions.py
index c9c6bf69..68249b81 100644
--- a/apps/note/models/transactions.py
+++ b/apps/note/models/transactions.py
@@ -1,6 +1,6 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
-
+from django.core.exceptions import ValidationError
 from django.db import models
 from django.urls import reverse
 from django.utils import timezone
@@ -273,7 +273,8 @@ class SpecialTransaction(Transaction):
     def clean(self):
         # SpecialTransaction are only possible with NoteSpecial object
         if self.is_credit() == self.is_debit():
-            raise(ValidationError(_("A special transaction is only possible between a  Note associated to a payment method and a User or a Club")))
+            raise(ValidationError(_("A special transaction is only possible between a"
+                                    " Note associated to a payment method and a User or a Club")))
 
 
 class MembershipTransaction(Transaction):
diff --git a/apps/permission/backends.py b/apps/permission/backends.py
index 8fa47f37..94816bfe 100644
--- a/apps/permission/backends.py
+++ b/apps/permission/backends.py
@@ -3,6 +3,7 @@
 
 import datetime
 
+from django.conf import settings
 from django.contrib.auth.backends import ModelBackend
 from django.contrib.auth.models import User, AnonymousUser
 from django.contrib.contenttypes.models import ContentType
@@ -52,9 +53,9 @@ class PermissionBackend(ModelBackend):
             & Q(mask__rank__lte=get_current_session().get("permission_mask", 0))
         )
 
-        try:
+        if settings.DATABASES[qs.db]["ENGINE"] == 'django.db.backends.postgresql_psycopg2':
             qs = qs.distinct('pk', 'club')
-        except:  # SQLite doesn't support distinct fields.
+        else:  # SQLite doesn't support distinct fields.
             qs = qs.distinct()
         return qs
 
diff --git a/apps/wei/management/commands/export_wei_registrations.py b/apps/wei/management/commands/export_wei_registrations.py
index f76852c8..2221e83f 100644
--- a/apps/wei/management/commands/export_wei_registrations.py
+++ b/apps/wei/management/commands/export_wei_registrations.py
@@ -4,7 +4,6 @@
 from django.core.management import BaseCommand, CommandError
 from django.db.models import Q
 from django.db.models.functions import Lower
-
 from wei.models import WEIClub, Bus, BusTeam, WEIMembership
 
 
@@ -65,7 +64,7 @@ class Command(BaseCommand):
 
         if team is not None:
             qs = qs.filter(team=team if team else None)
-            
+
         sep = options["sep"]
 
         self.stdout.write("Nom|Prénom|Date de naissance|Genre|Département|Année|Section|Bus|Équipe|Rôles"