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-rw-r--r--synapse/api/auth.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 86f963c190..4f116184c9 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -302,6 +302,12 @@ class Auth(object):
 
             # Check for application service tokens with a user_id override
             try:
+                if "user_id" not in request.args:
+                    # This has to be done like this rather than relying on it
+                    # natively throwing because tests use a Mock for the request
+                    # object which doesn't throw :/
+                    raise KeyError
+
                 masquerade_user_id = request.args["user_id"][0]
                 app_service = yield self.store.get_app_service_by_token(
                     access_token