Ajax comment sometimes doesn't get rendered after rendering

Problem/Motivation

Ajax comment sometimes doesn't get rendered after rendering.

How to reproduce
This is unclear, it happened to me twice on the demo content from the Distro. Once with admin and another time with user Michelle Clark. Both on the same event node (3). After a page reload the new comment is visible.
The error below seems to be the reason why, but haven't been able to find the cause of it.

Error: Call to a member function getComponent() on null in Drupal\ajax_comments\Controller\AjaxCommentsController->renderCommentField() (line 136 of /var/www/html/modules/contrib/ajax_comments/src/Controller/AjaxCommentsController.php) #0 /var/www/html/modules/contrib/ajax_comments/src/Controller/AjaxCommentsController.php(194): Drupal\ajax_comments\Controller\AjaxCommentsController->renderCommentField(Object(Drupal\social_node\Entity\Node), 'field_topic_com...') #1 /var/www/html/modules/contrib/ajax_comments/src/Controller/AjaxCommentsController.php(618): Drupal\ajax_comments\Controller\AjaxCommentsController->buildCommentFieldResponse(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Ajax\AjaxResponse), Object(Drupal\social_node\Entity\Node), 'field_topic_com...') #2 [internal function]: Drupal\ajax_comments\Controller\AjaxCommentsController->add(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\social_node\Entity\Node), 'field_topic_com...', '0') #3 /var/www/html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #4 /var/www/html/core/lib/Drupal/Core/Render/Renderer.php(573): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #5 /var/www/html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #6 /var/www/html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #7 /var/www/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #8 /var/www/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #9 /var/www/html/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #10 /var/www/html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #11 /var/www/html/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #12 /var/www/html/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #13 /var/www/html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #14 /var/www/html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #15 /var/www/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #16 /var/www/html/core/lib/Drupal/Core/DrupalKernel.php(694): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #17 /var/www/html/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #18 {main}.