Javascript error while expanding product categories on Prestashop 1.6 backoffice

[andrw]

Hi guys,

 

I have a Prestashop 1.6.1.14 store and at the backoffice when I'm adding a new product and I try to expand all the categories available to associate with the new product I get this error:

 

Uncaught TypeError: Cannot read property 'parent' of null at organizeTree (eval at <anonymous> (jquery-1.11.0.min.js:2), <anonymous>:33:32) at Object.eval [as success] (eval at <anonymous> (jquery-1.11.0.min.js:2), <anonymous>:195:6) at j (jquery-1.11.0.min.js:2) at Object.fireWith [as resolveWith] (jquery-1.11.0.min.js:2) at x (jquery-1.11.0.min.js:4) at XMLHttpRequest.b (jquery-1.11.0.min.js:4)

 

Anyone experiencing the same issue? Do you have any ideas on how to solve it? Thanks a lot