diff --git a/tiramisu_api/error.py b/tiramisu_api/error.py
index 1693afa..c015478 100644
--- a/tiramisu_api/error.py
+++ b/tiramisu_api/error.py
@@ -1,6 +1,6 @@
 try:
     from tiramisu.error import APIError, ValueWarning, ValueOptionError, ValueErrorWarning, PropertiesOptionError, ConfigError, display_list
-except ModuleNotFoundError:
+except (ModuleNotFoundError, ImportError):
     import weakref
     from .i18n import _
 
@@ -130,7 +130,7 @@ except ModuleNotFoundError:
             if self.msg:
                 return self.msg
             if self._option_bag is None:
-                return "unknown error"
+                return "option désactivée"
             req = self._settings.apply_requires(self._option_bag,
                                                 True)
             # if req != {} or self._orig_opt is not None: