When the ip4 addres is nil, it should try the next.

Signed-off-by: N黎咏 <s_xun_s@163.com>

pkg/utils/idutils/id_utils.go

@@ -114,6 +114,9 @@ func IPv4() (net.IP, error) {
 		}
 
 		ip := ipnet.IP.To4()
+		if ip == nil {
+			continue
+		}
 		return ip, nil
 
 	}