From 7afc92e8973e8cc60bd77d1b89138ff87ebaeeec Mon Sep 17 00:00:00 2001
From: OMsai <97650182+omsai11@users.noreply.github.com>
Date: Mon, 18 Sep 2023 23:53:32 +0530
Subject: [PATCH] Update auth.py  tried to solve the issue no #15871

500 error when auth is null for a UIA request #15871
---
 synapse/handlers/auth.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 2b0c50513095..2cf2a4665eb5 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -481,8 +481,9 @@ async def check_ui_auth(
 
         sid: Optional[str] = None
         authdict = clientdict.pop("auth", {})
-        if "session" in authdict:
-            sid = authdict["session"]
+        if authdict is not None:
+            if "session" in authdict:
+                sid = authdict["session"]
 
         # Convert the URI and method to strings.
         uri = request.uri.decode("utf-8")