Why Session Out is happening when any pop-up window appears on the page?

Question

This is my web page :

I have the pop-up window on my web page That pop up appears on the click of "choose" button present on the above page ,It Looks like this :

After the selecting the image, I come back to my web page and after coming back from pop up window, if I clicked any where on the page the session is throwing me out to session time out page

Is there any problem to session time out because of the pop up window? Please reply with solution

I Would be very thankful for this.

Answer 1

It was the internal issue from where I was getting that issue. My question was not appropriate.