Mailchimp Lists stop working after cache rebuild

Thanks @Ruscoe.

I replied slowly here because

First - I tried your suggestion and cleared the cache specifically from that page in fact. No luck.

Second - i decided i would make sure all the other modules & drupal were updated just in case that had something to do with it. Now i'm on Drupal 8.2.2 and the issue persists. It still works great on local vagrant box, and doesn't work on live site. I even checked mailchimp's api keys page & it actually shows a call to /lists and successful response.

Third -

I also considered (from googling around) this issue where mailchimp isn't happy with my servers ssl. However i run the following from ssh:

echo GET | openssl s_client -CApath /etc/ssl/certs/ -connect us3.api.mailchimp.com:443 2>&1

... I get a successful response.

Fourth -

I considered that this could have something to do with my cache bins. So i switched my settings.php & settings.yaml files to look similar to local server - with

$settings['cache']['bins']['render'] = 'cache.backend.null'; 

But that still didn't change the fact that mailchimp lists don't refresh.

Definitely has something to do with caching. But I'm at a loss for why or how to fix.

I woke up this morning and they were magically working again. Then i hit ./drush cr and they stopped. :(

Thanks again for help!

PS - follow up on full error notice from error logs:

Notice: Trying to get property of non-object in mailchimp_get_lists() (line 119 of /path/to/site.com/web/modules/contrib/mailchimp/mailchimp.module) #0 /path/to/site.com/web/core/includes/bootstrap.inc(548): _drupal_error_handler_real(8, 'Trying to get p...', '/path/to/site...', 119, Array) #1 /path/to/site.com/web/modules/contrib/mailchimp/mailchimp.module(119): _drupal_error_handler(8, 'Trying to get p...', '/path/to/site...', 119, Array) #2 /path/to/site.com/web/modules/contrib/mailchimp/modules/mailchimp_lists/src/Form/MailchimpListsClearCacheForm.php(58): mailchimp_get_lists(Array, true) #3 [internal function]: Drupal\mailchimp_lists\Form\MailchimpListsClearCacheForm->submitForm(Array, Object(Drupal\Core\Form\FormState)) #4 /path/to/site.com/web/core/lib/Drupal/Core/Form/FormSubmitter.php(111): call_user_func_array(Array, Array) #5 /path/to/site.com/web/core/lib/Drupal/Core/Form/FormSubmitter.php(51): Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object(Drupal\Core\Form\FormState)) #6 /path/to/site.com/web/core/lib/Drupal/Core/Form/FormBuilder.php(585): Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object(Drupal\Core\Form\FormState)) #7 /path/to/site.com/web/core/lib/Drupal/Core/Form/FormBuilder.php(314): Drupal\Core\Form\FormBuilder->processForm('mailchimp_lists...', Array, Object(Drupal\Core\Form\FormState)) #8 /path/to/site.com/web/core/lib/Drupal/Core/Controller/FormController.php(74): Drupal\Core\Form\FormBuilder->buildForm('mailchimp_lists...', Object(Drupal\Core\Form\FormState)) #9 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #10 /path/to/site.com/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #11 /path/to/site.com/web/core/lib/Drupal/Core/Render/Renderer.php(574): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #12 /path/to/site.com/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #13 /path/to/site.com/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #14 [internal function]: Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #15 /path/to/site.com/vendor/symfony/http-kernel/HttpKernel.php(144): call_user_func_array(Object(Closure), Array) #16 /path/to/site.com/vendor/symfony/http-kernel/HttpKernel.php(64): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #17 /path/to/site.com/web/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #18 /path/to/site.com/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 /path/to/site.com/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 /path/to/site.com/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /path/to/site.com/web/core/modules/ban/src/BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /path/to/site.com/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\ban\BanMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /path/to/site.com/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(50): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /path/to/site.com/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 /path/to/site.com/web/core/lib/Drupal/Core/DrupalKernel.php(652): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #26 /path/to/site.com/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #27 {main}.