product comparison is not working in 1.4.6.2

[venkatesh]

I am using prestashop 1.4.6.2. After selecting products and click on compare button the url is redirecting like this

http://www.flowers.c...e_product_list=

and the page become blank. The products checked previously not unchecked until doing manually.

whats the problem with url and where I have to change code?

 

 

 

Thanks.