diff --git a/swh/auth/django/utils.py b/swh/auth/django/utils.py
--- a/swh/auth/django/utils.py
+++ b/swh/auth/django/utils.py
@@ -32,11 +32,11 @@
     # create a Django user that will not be saved to database
     user = OIDCUser(
         id=user_id,
-        username=decoded_token["preferred_username"],
+        username=decoded_token.get("preferred_username", ""),
         password="",
-        first_name=decoded_token["given_name"],
-        last_name=decoded_token["family_name"],
-        email=decoded_token["email"],
+        first_name=decoded_token.get("given_name", ""),
+        last_name=decoded_token.get("family_name", ""),
+        email=decoded_token.get("email", ""),
     )
 
     # set is_staff user property based on groups
diff --git a/swh/auth/tests/test_utils.py b/swh/auth/tests/test_utils.py
--- a/swh/auth/tests/test_utils.py
+++ b/swh/auth/tests/test_utils.py
@@ -6,6 +6,8 @@
 from copy import copy
 from datetime import datetime
 
+import pytest
+
 from swh.auth.django.utils import oidc_user_from_decoded_token, oidc_user_from_profile
 from swh.auth.tests.sample_data import CLIENT_ID, DECODED_TOKEN, OIDC_PROFILE
 
@@ -42,6 +44,30 @@
     assert user.sub == "feacd344-b468-4a65-a236-14f61e6b7200"
 
 
+@pytest.mark.parametrize(
+    "key,mapped_key",
+    [
+        ("preferred_username", "username"),
+        ("given_name", "first_name"),
+        ("family_name", "last_name"),
+        ("email", "email"),
+    ],
+)
+def test_oidc_user_from_decoded_token_empty_fields_ok(key, mapped_key):
+    decoded_token = copy(DECODED_TOKEN)
+    decoded_token.pop(key, None)
+
+    user = oidc_user_from_decoded_token(decoded_token, client_id=CLIENT_ID)
+
+    assert user.id == 338521271020811424925120118444075479552
+    assert user.password == ""
+    assert user.is_staff is False
+    assert user.permissions == set()
+    assert user.sub == "feacd344-b468-4a65-a236-14f61e6b7200"
+    # Ensure the missing field is mapped to an empty value
+    assert getattr(user, mapped_key) == ""
+
+
 def test_oidc_user_from_profile(keycloak_mock):
     date_now = datetime.now()