diff --git a/hgdemandimport/demandimportpy3.py b/hgdemandimport/demandimportpy3.py
--- a/hgdemandimport/demandimportpy3.py
+++ b/hgdemandimport/demandimportpy3.py
@@ -114,7 +114,7 @@
         if (
             spec is not None
             and spec.loader is not None
-            and getattr(spec.loader, "exec_module")
+            and getattr(spec.loader, "exec_module", None)
         ):
             spec.loader = _lazyloaderex(spec.loader)