404 error when add product from vendor frontend

Hello,

Can you please send us a screenshot of the page.
I do have the feeling that there is a PHP error which is translated into a 404 page in your website.

Regards,

Hello,

There is bit more, we can see an error message

#0 CANNOT ACCESS OFFSET OF TYPE STRING ON STRING

Hello,

The issue looks related to the HikaShop core (field class).
I sent an email to the rest of the HikaShop team in order to understand the nature of your issue, that I can't reproduce for the moment.

Do you have product custom field configured ?
Maybe a "zone" product custom field ?

Regards,

Hello,

Can you please confirm that line 3079 in the mentioned file is:

if($field->field_type == 'zone' && $field->field_options['zone_type'] == 'state') {

Hello,

So that line can just be processed when a ZONE custom field is being checked.
In order to skip the issue, you can replace the line with

if($field->field_type == 'zone' && is_array($field->field_options) && $field->field_options['zone_type'] == 'state') {

Hello,

Next HikaShop release will include patchs for that kind of issue.
Nicolas worked on it.

Regards,