Custom fields error

-- url of the page with the problem -- : /administrator/index.php?option=com_hikashop&ctrl=field
-- HikaShop version -- : HikaShop Business 2.6.3
-- Joomla version -- : 3.5.1
-- PHP version -- : 5.5
-- Error-message(debug-mod must be tuned on) -- : PHP Warning: Creating default object from empty value in \administrator\components\com_hikashop\views\field\tmpl\form.php on line 478

Hello! I'm trying to add a custom field, options are shown on the screenshot. After I press "Save" I see an error. Actually, the field is saved, but then I see the same error when I'm trying to edit the field.

What's wrong?..

-- HikaShop version -- : HikaShop Business 2.6.3
-- Joomla version -- : 3.5.1
-- PHP version -- : 5.4.45

1. Similar problem here. After creating new custom field, for product category, which saves ok. And try to use it in the product, on save i get an error. I think my case has something to do with the limit size of the colum name. (50 characters)

2. Further more, I made in total 17 custom fields. Only 3 are apearing on back and front of the product. Again I have the feeling it has something to do with the access rights. But I am not sure.

3. On the back end of the product page is "User group after" none by default. If you do not change that it will not show on the front end.

Ok, I'll try and will turn on reporting afterwards.