1.6.1.11 don't save quantity

[wertigocore]

Hello

I using prestashop 1.6.1.11 with default bootstrap template. For some products, even when a new product, everything works except the setting quantity. I have adjusted manually enter the amount. After the change of quantity and change focus there's​ green Ajax confirmation box with "changes saved" but quantity remain the same. Where can be problem? If someone was able to help me, I'd be grateful.

 

Thanks Honza

 

 

Edit:

From mozzila console:

 

<div class="alert alert-danger">

<button type="button" class="close" data-dismiss="alert">×</button>

Duplicate entry '0-1' for key 'PRIMARY'<br /><br /><pre>INSERT INTO `sh_product_location_lang` (`id_product`, `id_lang`, `infowindow`) VALUES ('0', '1', ' ')</pre>

</div>

 

Edit 2: after dev mode enabled red Ajax notice popup :

parsererror: SyntaxError: Unexpected token <in JSON at position 0

Edited March 16, 2017 by wertigocore (see edit history)

[pandorrah]

Having a similar problem with PS 1.6.1.7: cannot save changes in quantity.