1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/oidc_handler.py b/synapse/handlers/oidc_handler.py
index bc3630e9e9..6624212d6f 100644
--- a/synapse/handlers/oidc_handler.py
+++ b/synapse/handlers/oidc_handler.py
@@ -149,6 +149,9 @@ class OidcHandler:
         Args:
             request: the incoming request from the browser.
         """
+        # This will always be set by the time Twisted calls us.
+        assert request.args is not None
+
         # The provider might redirect with an error.
         # In that case, just display it as-is.
         if b"error" in request.args: