1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index efc68cb9b4..c5ff072d5a 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -1034,6 +1034,9 @@ class IdentityHandler(BaseHandler):
         """
         # Extract the domain name from the IS URL as we store IS domains instead of URLs
         id_server = urllib.parse.urlparse(id_server_url).hostname
+        if not id_server:
+            # We were unable to determine the hostname, bail out
+            return
 
         # id_server_url is assumed to have no trailing slashes
         url = id_server_url + "/_matrix/identity/internal/bind"