diff --git a/src/mmw/apps/user/backends.py b/src/mmw/apps/user/backends.py
index c5c3df69d..7197f3b01 100644
--- a/src/mmw/apps/user/backends.py
+++ b/src/mmw/apps/user/backends.py
@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
 from django.core.exceptions import ObjectDoesNotExist
+from django.contrib.auth.backends import BaseBackend
 from django.contrib.auth.models import User
 
 from apps.user.models import ItsiUser, ConcordUser
 
 
-class SSOAuthenticationBackend(object):
+class SSOAuthenticationBackend(BaseBackend):
     """
     A custom authentication back-end for Single Sign On providers.
 
@@ -20,7 +21,7 @@ def __init__(self, model, field):
         self.SSOUserModel = model
         self.SSOField = field
 
-    def authenticate(self, sso_id=None):
+    def authenticate(self, request=None, sso_id=None):
         if sso_id is not None:
             try:
                 query = {self.SSOField: sso_id}
diff --git a/src/mmw/apps/user/views.py b/src/mmw/apps/user/views.py
index 94f13c5c4..abb9f7b14 100644
--- a/src/mmw/apps/user/views.py
+++ b/src/mmw/apps/user/views.py
@@ -283,7 +283,11 @@ def concord_auth(request):
         concord_user = session.get_user()
     except Exception as e:
         # Report OAuth error
-        rollbar.report_message(f'Concord OAuth Error: {e.message}', 'error')
+        message = 'Concord OAuth Error'
+        if hasattr(e, 'message'):
+            message += f': {e.message}'
+
+        rollbar.report_message(message, 'error')
         return redirect('/error/sso')
 
     user = authenticate(sso_id=concord_user['id'])