QIF installer.execute() is killed after app uninstallation

[advm]

Hi, I have problem with executing command while uninstalling the application.
I am trying with simple pwd command.

If I run the command before uninstallation is started, it works and installer.execute() returns error code 0. But If I run the command on the last Finished page(after uninstallation) the command is killed and it returns error code 9. This is an example with my approach in controlscript.js:

// Before uninstallation 
Controller.prototype.ReadyForInstallationPageCallback = function()
{
    if (installer.isUninstaller()) {
        let result = installer.execute("pwd");
        QMessageBox.warning("quit.question", "Result", result, QMessageBox.Ok);
    }
}

// After uninstallation
Controller.prototype.FinishedPageCallback = function ()
{
    if (installer.isUninstaller()) {
        let result = installer.execute("pwd");
        QMessageBox.warning("quit.question", "Result", result, QMessageBox.Ok);
    }
}

This is from the command on ReadyForInstallationPageCallback:

And this is from the execution on FinishedPageCallback :

The same approach is for windows/linux, but it is successful and both results are 0.

Any ideas why is this problem on macOS or suggestions to avoid this problem?