Wrap export in try: finally:

export/main.py

@@ -12,7 +12,10 @@ chrome_options = Options()
 chrome_options.add_argument('--headless')
 chrome_options.add_argument('start-maximized')
 chrome_options.add_argument('--no-sandbox')
+
 driver = webdriver.Chrome(service=ser, options=chrome_options)
+
+try:
     driver.get('https://sensors.dns.t0.vc')
     time.sleep(3)
 
@@ -45,6 +48,9 @@ for graph in graphs:
         with open('/home/tanner/sensors/export/data/{}.png'.format(graph), 'wb') as f:
             f.write(element.screenshot_as_png)
 
+finally:
     driver.close()
+    driver.quit()
+
 print('done.')