1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/module_api/__init__.py b/synapse/module_api/__init__.py
index 1cc13fc97b..82725853bc 100644
--- a/synapse/module_api/__init__.py
+++ b/synapse/module_api/__init__.py
@@ -677,7 +677,10 @@ class ModuleApi:
             A list containing the loaded templates, with the orders matching the one of
             the filenames parameter.
         """
-        return self._hs.config.read_templates(filenames, custom_template_directory)
+        return self._hs.config.read_templates(
+            filenames,
+            (td for td in (custom_template_directory,) if td),
+        )
 
 
 class PublicRoomListManager: