stop jQuery UI dialogue box scroll top when close

I have this problem that when I close jQuery UI dialog, the window keeps scrolling to top but I just want my window to stay in the same position. Please have a look at this clip

https://www.screencast.com/t/lhawhmVpiG

After going through the close function in the library, I notice this is the part of the code that trigger the scrolling (please correct me if I am wrong).

if ( !this.opener.filter( ":focusable" ).trigger( "focus" ).length ) {

        // Hiding a focused element doesn't trigger blur in WebKit
        // so in case we have nothing to focus on, explicitly blur the active element
        // https://bugs.webkit.org/show_bug.cgi?id=47182
        $.ui.safeBlur( $.ui.safeActiveElement( this.document[ 0 ] ) );
    }

Is there a way I can fix that without modifying the library? thanks.