selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document

import os
import time
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from ..default.helpers import scrapehelper as sh

def scrape(username: str, password: str) -> None:
   current_dir = os.path.dirname(os.path.abspath(__file__))
   driver = sh.get_driver("chrome")
   driver.implicitly_wait(20)
   driver.get("https://automationdrivestore.com/")
   buttons = driver.find_elements_by_class_name("cs-landing-page-btn")
   for button in buttons:
     button.click()
     time.sleep(5)
     getNames = driver.find_elements_by_class_name('apps-list__item-name')
     for Names in getNames:
      # entering site
      Names.click()
      time.sleep(2)
      driver.back()
      driver.implicitly_wait(20)
      time.sleep(5)