Manual IP address

Brief description of the problem

I tried to activate the second network card in the server.
But I get an error message.
All needed fields are filled.

Detailed step by step instructions to reproduce the problem

[write here]

Web-UI screenshot

Error Traceback provided on the Web-UI

        Traceback (most recent call last):

File “/opt/rockstor/src/rockstor/rest_framework_custom/”, line 41, in _handle_exception
File “/opt/rockstor/src/rockstor/storageadmin/views/”, line 321, in put
device = nco.networkdevice_set.first().name
AttributeError: ‘NoneType’ object has no attribute ‘name’

Btw.: latest version 3.1.9-16

And the screen before looks like: