How do I stop exceptions trashing my delegate chain?

static void InvokeIgnoreErrors(this EventHandler handler,
        object sender) {
    if(handler != null) {
        foreach(EventHandler subHandler in handler.GetInvocationList()) {
            subHandler(sender, EventArgs.Empty);
        }
    }
}

static bool InvokeCheckCancel(this CancelEventHandler handler,
        object sender) {
    if(handler != null) {
        CancelEventArgs args = new CancelEventArgs(false);
        foreach(CancelEventHandler subHandler in handler.GetInvocationList()) {
            subHandler(sender, args);
            if(args.Cancel) return true;
        }
    }
    return false;
}