Timing error on Page Load with User Control

[Loopy]

Each of the aspx pages in my application have a User Control called
"WrapStart".

In a page's Page_Load() method, I set various properties and/or call
various methods of the WrapStart control object. Everything works
fine... except...

....when I click too quickly from one page to another (or quickly
reload the same page). When I do, I get the following error:

"Object reference not set to an instance of an object."

And the line highlighted in the error is: WrapStart.someMethod();


I'm wondering what is going on and how do I fix this problem. Any
help would be greatly appreciated.