why can not add related products and all null

-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.27
-- Browser(s) name and version -- : chrome
-- Error-message(debug-mod must be tuned on) -- : cann't add related products display null

After upgrade to hikashop2.5.0,I was scared by the only one column style of 2.5.0.
I doubt if I already installed successfully.I tried three times and it was the same.

Now I found on problem that I can not add related products when editing.I couldn't select beause all products displayed null,please see it in attachment.

Anything wrong?
Please help ,thank you very much.

Hello,

Now I found on problem that I can not add related products when editing.I couldn't select beause all products displayed null,please see it in attachment.

ok, SOLVED.
thank you.