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-rw-r--r--synapse/rest/well_known.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/rest/well_known.py b/synapse/rest/well_known.py
index 241fe746d9..f591cc6c5c 100644
--- a/synapse/rest/well_known.py
+++ b/synapse/rest/well_known.py
@@ -34,6 +34,10 @@ class WellKnownBuilder:
         self._config = hs.config
 
     def get_well_known(self):
+        # if we don't have a public_baseurl, we can't help much here.
+        if self._config.public_baseurl is None:
+            return None
+
         result = {"m.homeserver": {"base_url": self._config.public_baseurl}}
 
         if self._config.default_identity_server: