diff --git a/tiramisu/config.py b/tiramisu/config.py
index a923d47..1381d57 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -711,4 +711,6 @@ def mandatory_warnings(config):
         except PropertiesOptionError as err:
             if err.proptype == ['mandatory']:
                 yield path
+        except ConfigError:
+            pass
     config.cfgimpl_reset_cache(only=('values',))