diff --git a/loko/common/tests.py b/loko/common/tests.py
index e6957e9..f0ab794 100644
--- a/loko/common/tests.py
+++ b/loko/common/tests.py
@@ -290,6 +290,40 @@ class AssetsIndexPreferencesTests(TestCase):
         self.assertFalse(response.context["has_url_thematics"])
         self.assertEqual(response.context["selected_thematics"], ["sign", "roads"])
 
+    def test_save_assets_index_preferences_with_type_filter_list(self):
+        self.client.force_login(self.superuser)
+        save_url = reverse("common:save_assets_index_preferences")
+        payload = {
+            "thematics": ["sign"],
+            "categories": [],
+            "models": [],
+            "conditional_filters": {},
+            "type_filter": ["assets", "locations", "management_zones"],
+            "status_filters": [],
+            "validation_status_filters": [],
+            "include_no_geom": True,
+        }
+        response = self.client.post(save_url, json.dumps(payload), content_type="application/json")
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue(response.json().get("success"))
+
+        from common.models import UserConfig
+        config = UserConfig.objects.get(user=self.superuser)
+        self.assertEqual(
+            config.assets_index_preferences.get("type_filter"),
+            ["assets", "locations", "management_zones"]
+        )
+
+    def test_save_assets_index_preferences_invalid_type_filter_returns_400(self):
+        self.client.force_login(self.superuser)
+        save_url = reverse("common:save_assets_index_preferences")
+        payload = {
+            "type_filter": 12345,
+        }
+        response = self.client.post(save_url, json.dumps(payload), content_type="application/json")
+        self.assertEqual(response.status_code, 400)
+        self.assertIn("error", response.json())
+
 
 
 class UserConfigCopyTests(TestCase):
diff --git a/loko/common/views.py b/loko/common/views.py
index b9e49f6..1683737 100644
--- a/loko/common/views.py
+++ b/loko/common/views.py
@@ -674,7 +674,7 @@ def save_assets_index_preferences(request):
         return JsonResponse({'error': _('Format de filtres thématiques invalide')}, status=400)
     if visible_columns is not None and not isinstance(visible_columns, list):
         return JsonResponse({'error': _('Format de colonnes visibles invalide')}, status=400)
-    if not isinstance(type_filter, str):
+    if not (isinstance(type_filter, str) or (isinstance(type_filter, list) and all(isinstance(x, str) for x in type_filter))):
         return JsonResponse({'error': _('Format de filtre type invalide')}, status=400)
     if not isinstance(status_filters, list):
         return JsonResponse({'error': _('Format de filtres statut invalide')}, status=400)
@@ -682,7 +682,7 @@ def save_assets_index_preferences(request):
         return JsonResponse({'error': _('Format de filtres statut de validation invalide')}, status=400)
 
     try:
-        user_config, _ = UserConfig.objects.get_or_create(user=request.user)
+        user_config, _created = UserConfig.objects.get_or_create(user=request.user)
         existing_prefs = user_config.assets_index_preferences or {}
         existing_visible_columns = existing_prefs.get('visible_columns', []) if isinstance(existing_prefs, dict) else []
         if not isinstance(existing_visible_columns, list):
@@ -825,9 +825,9 @@ def set_language(request):
     response = django_set_language(request)
     if request.user.is_authenticated and request.method == 'POST':
         lang_code = request.POST.get('language')
-        valid_langs = [code for code, _ in getattr(settings, 'LANGUAGES', [('fr', 'Français'), ('nl', 'Nederlands'), ('en', 'English')])]
+        valid_langs = [code for code, _lang_name in getattr(settings, 'LANGUAGES', [('fr', 'Français'), ('nl', 'Nederlands'), ('en', 'English')])]
         if lang_code and lang_code in valid_langs:
-            config, _ = UserConfig.objects.get_or_create(user=request.user)
+            config, _created = UserConfig.objects.get_or_create(user=request.user)
             if config.preferred_language != lang_code:
                 config.preferred_language = lang_code
                 config.save(update_fields=['preferred_language'])