Custom attributes don't work

[kparaskev]

Impacted versions:
Odoo product configurator version 10
Steps to reproduce:
Create a custom attribute named length with values 0 - 100
Create a configuration template called door and use only the attribute length
Create a Sales Order and try to configure a door with length 50
Current behavior:
The wizards that opens doesn't close when you specify the custom value, and no variant is created.
Expected behavior:
A variant should be created and the wizard should proceed to the next step
Video/Screenshot link (optional):
https://drive.google.com/file/d/1Moo8KW66QsmGx7_YbuFbn7WeYcSxrlR7/view