diff --git a/main.py b/main.py
index 8b6896c..294ccc2 100755
--- a/main.py
+++ b/main.py
@@ -285,7 +285,8 @@ class iptables:
         def add_specific_rule(ports, ip_type, chain, interface, subnet, protocol, direction):
             """Règles spécifique, fonction de factorisation"""
             if ip_type == '4':
-                self.add_in_subtable(chain, subtable, """-%s %s -p %s -m multiport --dports %s -j RETURN""" % (direction[0], interface['ipv4'], protocol, ports))
+                if interface['ipv4']:
+                    self.add_in_subtable(chain, subtable, """-%s %s -p %s -m multiport --dports %s -j RETURN""" % (direction[0], interface['ipv4'], protocol, ports))
             if ip_type == '6':
                 for ipv6_addr in interface['ipv6']:
                     self.add_in_subtable(chain, subtable, """-%s %s -p %s -m multiport --dports %s -j RETURN""" % (direction[0], ipv6_addr['ipv6'], protocol, ports))