Cannot create or modify products

-- HikaShop version -- : 4.2.1
-- Joomla version -- : 3.9.11
-- PHP version -- : 7.2.22
-- Browser(s) name and version -- : Chrome Linux 76.0.3809.100
-- Error-message(debug-mod must be tuned on) -- : Uncaught TypeError: window.oNamebox is not a constructor
at index.php?option=com_hikashop&ctrl=product&task=edit&cid[]=1:87

When I try to add or modify an existing product, the product edit page appears (but without any styling),
and I got a number of JS errors in "index.php":

Uncaught TypeError: Cannot read property 'ready' of undefined at index.php?option=com_hikashop&ctrl=product&task=edit&cid[]=1:45
Uncaught TypeError: window.oNamebox is not a constructor at index.php?option=com_hikashop&ctrl=product&task=edit&cid[]=1:87
Uncaught TypeError: window.oNamebox is not a constructor at index.php?option=com_hikashop&ctrl=product&task=edit&cid[]=1:110
Uncaught TypeError: Cannot read property 'ready' of undefined at index.php?option=com…sk=edit&cid[]=1:316

All other thing seem to work.

Perfect, thank you! Will drop JCE in favour of tinyMCE.