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-rw-r--r--synapse/config/sso.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/config/sso.py b/synapse/config/sso.py
index d0f04cf8e6..4b590e0535 100644
--- a/synapse/config/sso.py
+++ b/synapse/config/sso.py
@@ -63,7 +63,7 @@ class SSOConfig(Config):
                 "sso_auth_success.html",
                 "sso_auth_bad_user.html",
             ],
-            self.sso_template_dir,
+            (td for td in (self.sso_template_dir,) if td),
         )
 
         # These templates have no placeholders, so render them here