target window already closed from unknown error: web view not found

String mainWindow = driver.getWindowHandle();
driver.findElement(By.xpath(pro.getProperty(""))).click();

for(String newWindow : driver.getWindowHandles()){
    driver.switchTo().window(newWindow);
}

driver.close();

Log.info("Closing the current Opened Window - Invoice");
driver.switchTo().window(mainWindow); ---error in this line

I am getting error while switching to main window.

org.openqa.selenium.NoSuchWindowException: no such window: target window already closed from unknown error: web view not found

I have tried switching to default window, commenting driver.close and adding thread.sleep also but issue not resolved.