diff --git a/gestion/numeros_disponibles.py b/gestion/numeros_disponibles.py
index 4162dfe6..40c04662 100644
--- a/gestion/numeros_disponibles.py
+++ b/gestion/numeros_disponibles.py
@@ -13,8 +13,8 @@ from config import NETs
 from iptools import AddrInNet
 try:
     from dialog import Dialog
-except:
-    pass
+except ImportError:
+    Dialog = None
 
 repertoire =  '/usr/scripts/var/numeros_disponibles/'