diff --git a/gestion/gen_confs/filtrage.py b/gestion/gen_confs/filtrage.py
index e2c72dd4..f10a0d9a 100644
--- a/gestion/gen_confs/filtrage.py
+++ b/gestion/gen_confs/filtrage.py
@@ -45,9 +45,13 @@ class exemptions(gen_config):
         for machine in machines:
             for destination in machine["exempt"]:
                 if destination.value.version == 4:
+                    if not machine['ipHostNumber']:
+                        continue
                     source = str(machine["ipHostNumber"][0])
                     requete = "INSERT INTO exemptes (ip_crans, ip_dest) VALUES ('%s','%s')" % (source, destination)
                 else:
+                    if not machine['macAddress']:
+                        continue
                     source = str(machine["macAddress"][0])
                     requete = "INSERT INTO exemptes6 (mac_crans, ip_dest) VALUES ('%s','%s')" % (source, destination)
                 # Si ip vide, passons au suivant