1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index a63eaddfdc..11ca47ea28 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -487,6 +487,10 @@ def _upgrade_existing_database(
                 spec = importlib.util.spec_from_file_location(
                     module_name, absolute_path
                 )
+                if spec is None:
+                    raise RuntimeError(
+                        f"Could not build a module spec for {module_name} at {absolute_path}"
+                    )
                 module = importlib.util.module_from_spec(spec)
                 spec.loader.exec_module(module)  # type: ignore