How can I get Selenium to keep pulling down vertical scroll bar in element?

Question

So I am trying to get Selenium to keep pulling down vertical scroll bar in an element, see here. Vertical scrolling

This is the code I have been using, it does work - However when most is loaded, it just suddenly stops and keep loading further followers in Instagram

def _get_names(self):
    sleep(2)
    scroll_box = self.driver.find_element(By.XPATH, "/html/body/div[6]/div/div/div/div[3]")
    last_ht, ht = 0, 1
    while last_ht != ht:
        last_ht = ht
        sleep(1)
        ht = self.driver.execute_script("""
            arguments[0].scrollTo(0, arguments[0].scrollHeight); 
            return arguments[0].scrollHeight;
            """, scroll_box)
    links = scroll_box.find_elements_by_tag_name('a')
    names = [name.text for name in links if name.text != '']
    # close button
    self.driver.find_element(By.XPATH, "/html/body/div[4]/div/div[1]/div/div[2]/button")\
        .click()
    return names

Which then means, it is not checking all Followers, as it stops scrolling.