Hiding Script Errors popups in IE8

Question

I have inherited an application that download a js code from another place and with the help of the IWebBrowser2 interface in Windows it runs this js in that browser inside a hWindow. While i run the app on the machines with IE9 and IE10 no popups with script errors. When i run the app in a machine with IE8 i can see a script error message appears. I tried to disable the script errors inside the Internet options advanced tab and also cleared the Enable 3-party browser extensions. Those didn't help to suppress the script Error. Perhaps, someone knows how i can get rid of the script error in IE8.