diff --git a/surveillance/demenagement.py b/surveillance/demenagement.py
index 474c82f2..a6e2faa2 100755
--- a/surveillance/demenagement.py
+++ b/surveillance/demenagement.py
@@ -63,7 +63,11 @@ chambre = {}
 for host in switchs:
     progression.cycle()
     switch = hpswitch(host)
-    for prise in range(1,switch.nb_prises()+1):
+    try:
+        nb_prises = switch.nb_prises()
+    except:
+        continue
+    for prise in range(1, nb_prises+1):
         if prise < 10:
             prise = '0%d'%prise
         else :