Item search macro

Hi,

I am a new one on this forum. I have an excel macro that searches the item number from the website and scrap some specific information from the web page like avalibility, price, page url. But after scraping some pages, it gives me error (Runtime error 91, Object variable or With block variable not set). I don't know why this is happening again and again, also this macro works very slowly. can anyone fix this one.

I have office 2007 and IE9

Kind regards,
GM SYIAL