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-rw-r--r--synapse/api/auth.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index b8c2917f21..b17025c7ce 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -39,6 +39,9 @@ AuthEventTypes = (
     EventTypes.ThirdPartyInvite,
 )
 
+# guests always get this device id.
+GUEST_DEVICE_ID = "guest_device"
+
 
 class Auth(object):
     """
@@ -717,7 +720,8 @@ class Auth(object):
                     "user": user,
                     "is_guest": True,
                     "token_id": None,
-                    "device_id": None,
+                    # all guests get the same device id
+                    "device_id": GUEST_DEVICE_ID,
                 }
             elif rights == "delete_pusher":
                 # We don't store these tokens in the database