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-rw-r--r--synapse/handlers/identity.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index 71b5a87392..45db1c1c06 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -151,12 +151,18 @@ class IdentityHandler(BaseHandler):
             creds
         )
 
+        sid = creds.get("sid")
+        if not sid:
+            raise SynapseError(
+                400, "No sid in three_pid_creds", errcode=Codes.MISSING_PARAM
+            )
+
         # If an id_access_token is not supplied, force usage of v1
         if id_access_token is None:
             use_v2 = False
 
         # Decide which API endpoint URLs to use
-        bind_data = {"sid": creds["sid"], "client_secret": client_secret, "mxid": mxid}
+        bind_data = {"sid": sid, "client_secret": client_secret, "mxid": mxid}
         if use_v2:
             bind_url = "https://%s/_matrix/identity/v2/3pid/bind" % (id_server,)
             bind_data["id_access_token"] = id_access_token