diff --git a/capsul/engine/settings.py b/capsul/engine/settings.py
index e9fa9b65..e50a3037 100644
--- a/capsul/engine/settings.py
+++ b/capsul/engine/settings.py
@@ -318,7 +318,8 @@ def import_configs(self, environment, config_dict, cont_on_error=False):
                                     for k, v in config.items()
                                     if k not in ("config_id", "config_environment")
                                 }
-                                conf.set_values(values)
+                                if values:
+                                    conf.set_values(values)
                             else:
                                 session.new_config(module, environment, config)
                         except Exception as e: