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-rw-r--r--synapse/rest/client/v2_alpha/register.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 68d18a9b82..6cfb20866b 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -169,6 +169,17 @@ class RegisterRestServlet(RestServlet):
 
         guest_access_token = body.get("guest_access_token", None)
 
+        if (
+            'initial_device_display_name' in body and
+            'password' not in body
+        ):
+            # ignore 'initial_device_display_name' if sent without
+            # a password to work around a client bug where it sent
+            # the 'initial_device_display_name' param alone, wiping out
+            # the original registration params
+            logger.warn("Ignoring initial_device_display_name without password")
+            del body['initial_device_display_name']
+
         session_id = self.auth_handler.get_session_id(body)
         registered_user_id = None
         if session_id: