Web application has different values wether console is open or closed

My Web Application is acting out. With the (google chrome) debug console closed the application works as intended, it downloads an image and places it on the page. When I open the console for the same application and run it, it can't read the size values of the downloaded image. Is this chrome bug? Is there a way to fix this problem?

Resulting values with console closed:

Resulting size with console opened:

This problem does not appear to occur in Firefox browser