Error inside NT 50-CC-RS Gateway in case of enabling the "Network Address Switch"

Steps to reproduce:

1. Create NT 50-XX-XX device.

2. In Settings: set Base : CC-Link Slave, Sub : Modbus RTU

3. Check -> Network Address Switch -> Enable

4. Press "Apply button"

Current result :

An error message is shown.

Expected result:

There shoud be no errors.