diff --git a/gestion/gest_crans.py b/gestion/gest_crans.py
index c582d76b..cd4bd897 100755
--- a/gestion/gest_crans.py
+++ b/gestion/gest_crans.py
@@ -1216,7 +1216,8 @@ def set_machine(machine) :
         except ValueError, c : err += c.args[0] + '\n'
         
     if isadm and machine.proprietaire().__class__ == crans : 
-        machine.prise(result[-1])
+	try : machine.prise(result[-1])
+	except ValueError,c : err += c.args[0] + '\n'
         
     # Des erreurs ?
     if err :