diff --git a/roles/badges/backend/files/get-sar-person-details b/roles/badges/backend/files/get-sar-person-details
index a821d2946f..9f9ed67edb 100644
--- a/roles/badges/backend/files/get-sar-person-details
+++ b/roles/badges/backend/files/get-sar-person-details
@@ -51,7 +51,8 @@ def main():
         'website': person.website,
         'bio': person.bio,
         'created_on': person.created_on.isoformat(),
-        'last_login': person.last_login.isoformat(),
+        'last_login': person.last_login.isoformat()
+        if person.last_login else 'unknown',
         'opt_out': person.opt_out,
         'rank': person.rank,
         'assertions': []