diff --git a/gestion/whos.py b/gestion/whos.py
index ca204be6..8ed10dbd 100755
--- a/gestion/whos.py
+++ b/gestion/whos.py
@@ -593,10 +593,12 @@ def machine_details(machine) :
             f += u'%s°N, %s°E\n' % position
         else:
             f += '\n'
-        f += coul(u'VLANs : ', 'gras')
-        from hptools import sw_prise
-        f += ', '.join(sw_prise(machine.prise()).vlans())
-        f += '\n' 
+
+        if (machine.prise() != 'N/A'):
+            f += coul(u'VLANs : ', 'gras')
+            from hptools import sw_prise
+            f += ', '.join(sw_prise(machine.prise()).vlans())
+            f += '\n' 
             
         f += coul(u'Puissance : ','gras') + u"%4.d" % int(machine.puissance())
         f += coul(u'\tCanaux : ', 'gras') + machine.canal()