1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/handlers/cas_handler.py b/synapse/handlers/cas_handler.py
index f3430c6713..0f342c607b 100644
--- a/synapse/handlers/cas_handler.py
+++ b/synapse/handlers/cas_handler.py
@@ -80,6 +80,10 @@ class CasHandler:
         # user-facing name of this auth provider
         self.idp_name = "CAS"
 
+        # we do not currently support icons for CAS auth, but this is required by
+        # the SsoIdentityProvider protocol type.
+        self.idp_icon = None
+
         self._sso_handler = hs.get_sso_handler()
 
         self._sso_handler.register_identity_provider(self)