Error :: Response Object Error 'ASP 0101 : 80070057'

I have created an update image field which almost works perfectly. When you select an image and click on the update button it works just fine.

If you dont select and image and click on the update button you get the following error.

Response object error 'ASP 0101 : 80070057'
Unexpected error
/html/advertiser-premier-main.asp, line 0
The function returned |.

I know it seems pointless to worry about this as you would not expect people to press the update buttin unless they insert an immage, but im sure people will try.

Code: ....