Problem adding product with Single Multistep category selector

Hi,

Using 'Single Multistep' category selector option for vmvendor Add Product, it seems to only work when there is only 1 category level. For example:
- Category 1
- Category 2

When there are multiple levels, for example:
- Category 1
--- Category 1.1
- Category 2
--- Category 2.1

Then on the Add Product form, when the 'Add Product' submit button is pressed, nothing happens, and multiple errors are generated (e.g., on Chrome Inspect):

add-product:1 An invalid form control with name='' is not focusable.

To reproduce error:
andkit01.com/en/vmv-test/add-product
(user: user1, psw: user1)

Note 1: The same error occurs regardless of the Auto-Publish setting in vmvendor.
Note 2: The problem does not apply to the other type of category selector: Multicat, Classic.

Please help. Thanks.

Hello,

It seems to be a new chrome form validation feature that sees to be incompatible with the field nature. The solution could be to make hidden select fields (within this field) not required. I'll give it another try.

Hello, thank you Adrien,

Btw I also see the issue on Firefox, with an error message saying "Empty string passed to getElementById() on jquery.min.js:1236

Btw, what do you mean by hidden select fields?

In ./components/com_vmvendor/views/addproduct/tmpl/default.php file, on lines 386-390, the section for $level==1 seems much simpler than the other cases ($level==0, $level>1), is anything missing from this section by any chance? Seems like $c_js needs to have some non-empty instructions to be called later in line 470 '<script>'.$c_js.'</script>' ?

Also, I'm wondering what variable will contain the complete selected category and sub-categories IDs? Is it $cat ?