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-rw-r--r--synapse/config/saml2_config.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/config/saml2_config.py b/synapse/config/saml2_config.py
index 1820614bc0..4b494f217f 100644
--- a/synapse/config/saml2_config.py
+++ b/synapse/config/saml2_config.py
@@ -188,6 +188,8 @@ class SAML2Config(Config):
         import saml2
 
         public_baseurl = self.public_baseurl
+        if public_baseurl is None:
+            raise ConfigError("saml2_config requires a public_baseurl to be set")
 
         if self.saml2_grandfathered_mxid_source_attribute:
             optional_attributes.add(self.saml2_grandfathered_mxid_source_attribute)