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14 hours ago, El Patron said:

Hi, did you enable debug mode to see if underlying error exposed?  google how to enable debug mode  if you do not know how.  also check hosting error log when this happens.

tip, using chrome development tools inspect, you can look at console for errors when you have this issue to see if .js bug

learn more here about using chrome dev tools, very useful

the key is knowing that the underlying error is, 

Hi El Patron,

Thanks for your reply

With debug mode enabled, when I try to perform the action, the only bit that flashes red is the ajax entries

Method : POST

Type : xhr

Status : 500 

Time : 1369ms

Should I paste the Symfony Profiler profile info?

Chrome dev tools console error shows its a problem with prestashop ui kit js

prestashop-ui-kit.js:1 JQMIGRATE: Migrate is installed with logging active, version 3.3.2
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.expr[':'] is deprecated; use jQuery.expr.pseudos
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.expr.filters is deprecated; use jQuery.expr.pseudos
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.isArray is deprecated; use Array.isArray
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.isFunction() is deprecated
s @ prestashop-ui-kit.js:1
module_card.js?1.7.8.0:1 Uncaught SyntaxError: Identifier 'moduleCardController' has already been declared (at module_card.js?1.7.8.0:1:1)
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.click() event shorthand is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.hover() is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.resize() event shorthand is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.bind() is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.submit() event shorthand is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.change() event shorthand is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.unique is deprecated; use jQuery.uniqueSort
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.keyup() event shorthand is deprecated
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.parseJSON is deprecated; use JSON.parse
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.unbind() is deprecated
s @ prestashop-ui-kit.js:1
/w33m3admin/index.php/sell/catalog/products/358?_token=zjpWylQxSfUJs_akoDWnz6yM-j6CyDstjgp3iWhSrys#tab-step3:1          Failed to load resource: the server responded with a status of 500 ()
prestashop-ui-kit.js:1 JQMIGRATE: jQuery.fn.removeAttr no longer sets boolean properties: disabled
s @ prestashop-ui-kit.js:1
prestashop-ui-kit.js:1          POST https://weemeboutique.co.uk/w33m3admin/index.php/sell/catalog/products/358?_token=zjpWylQxSfUJs_akoDWnz6yM-j6CyDstjgp3iWhSrys 500
send @ prestashop-ui-kit.js:1
ajax @ prestashop-ui-kit.js:1
e.ajax @ prestashop-ui-kit.js:1
send @ form.js?1.7.8.0:677
(anonymous) @ form.js?1.7.8.0:876
dispatch @ prestashop-ui-kit.js:1
_.handle @ prestashop-ui-kit.js:1

Many thanks!