Notice: Undefined index: webform_confirmation in Drupal\webform\WebformSubmissionForm->form() (line 721 of /var/www/html/web/modules/contrib/webform/src/WebformSubmissionForm.php)

Problem/Motivation

When submitting a webform with the Confirmation Message set to Inline I get this error.

Notice: Undefined index: webform_confirmation in Drupal\webform\WebformSubmissionForm->form() (line 721 of /var/www/html/web/modules/contrib/webform/src/WebformSubmissionForm.php)
#0 /var/www/html/web/core/includes/bootstrap.inc(346): _drupal_error_handler_real(8, 'Undefined index...', '/var/www/html/w...', 721)
#1 /var/www/html/web/modules/contrib/webform/src/WebformSubmissionForm.php(721): _drupal_error_handler(8, 'Undefined index...', '/var/www/html/w...', 721, Array)
#2 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityForm.php(106): Drupal\webform\WebformSubmissionForm->form(Array, Object(Drupal\Core\Form\FormState))
#3 /var/www/html/web/modules/contrib/webform/src/WebformSubmissionForm.php(641): Drupal\Core\Entity\EntityForm->buildForm(Array, Object(Drupal\Core\Form\FormState))
#4 [internal function]: Drupal\webform\WebformSubmissionForm->buildForm(Array, Object(Drupal\Core\Form\FormState))
#5 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(531): call_user_func_array(Array, Array)
#6 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(370): Drupal\Core\Form\FormBuilder->retrieveForm('webform_submiss...', Object(Drupal\Core\Form\FormState))
#7 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(628): Drupal\Core\Form\FormBuilder->rebuildForm('webform_submiss...', Object(Drupal\Core\Form\FormState), Array)
#8 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(320): Drupal\Core\Form\FormBuilder->processForm('webform_submiss...', Array, Object(Drupal\Core\Form\FormState))
#9 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityFormBuilder.php(48): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\webform\WebformSubmissionForm), Object(Drupal\Core\Form\FormState))
#10 /var/www/html/web/modules/contrib/webform/src/Entity/Webform.php(1233): Drupal\Core\Entity\EntityFormBuilder->getForm(Object(Drupal\webform\Entity\WebformSubmission), 'add')
#11 /var/www/html/web/modules/contrib/webform/src/Element/Webform.php(78): Drupal\webform\Entity\Webform->getSubmissionForm(Array)
#12 [internal function]: Drupal\webform\Element\Webform::preRenderWebformElement(Array)
#13 /var/www/html/web/core/lib/Drupal/Core/Security/DoTrustedCallbackTrait.php(101): call_user_func_array(Array, Array)
#14 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(772): Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_ren...', 'exception', 'Drupal\\Core\\Ren...')
#15 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(363): Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array)
#16 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(435): Drupal\Core\Render\Renderer->doRender(Array)
#17 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(201): Drupal\Core\Render\Renderer->doRender(Array, false)
#18 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(463): Drupal\Core\Render\Renderer->render(Array)
#19 /var/www/html/vendor/twig/twig/src/Environment.php(418) : eval()'d code(73): Drupal\Core\Template\TwigExtension->escapeFilter(Object(Drupal\Core\Template\TwigEnvironment), Array, 'html', NULL, true)
#20 /var/www/html/vendor/twig/twig/src/Template.php(405): __TwigTemplate_80433c9265db1eeb24c8aa9401d0864a228872deaadb4452855e69af67edf937->doDisplay(Array, Array)
#21 /var/www/html/vendor/twig/twig/src/Template.php(378): Twig\Template->displayWithErrorHandling(Array, Array)
#22 /var/www/html/vendor/twig/twig/src/Template.php(390): Twig\Template->display(Array)
#23 /var/www/html/web/core/themes/engines/twig/twig.engine(55): Twig\Template->render(Array)
#24 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(384): twig_render_template('themes/custom/s...', Array)
#25 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(422): Drupal\Core\Theme\ThemeManager->render('field', Array)
#26 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(435): Drupal\Core\Render\Renderer->doRender(Array)
#27 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(435): Drupal\Core\Render\Renderer->doRender(Array)
#28 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(201): Drupal\Core\Render\Renderer->doRender(Array, false)
#29 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(463): Drupal\Core\Render\Renderer->render(Array)

Steps to reproduce

See /admin/structure/webform/manage/did_you_find_this_helpful_/settings/confirmation

Proposed resolution

I don't know

Remaining tasks

User interface changes

API changes

Data model changes