When I open the rule admin interface I get this error:
Error: Call to a member function get() on null in rules_webform_form_rules_reaction_rule_edit_form_alter() (line 148 of /var/www/vhosts/mydomain.org/web/modules/contrib/rules_webform/rules_webform.module) #0 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/Extension/ModuleHandler.php(539): rules_webform_form_rules_reaction_rule_edit_form_alter(Array, Object(Drupal\Core\Form\FormState), 'rules_reaction_...') #1 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/Form/FormBuilder.php(834): Drupal\Core\Extension\ModuleHandler->alter('form', Array, Object(Drupal\Core\Form\FormState), 'rules_reaction_...') #2 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/Form/FormBuilder.php(276): Drupal\Core\Form\FormBuilder->prepareForm('rules_reaction_...', Array, Object(Drupal\Core\Form\FormState)) #3 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/Controller/FormController.php(93): Drupal\Core\Form\FormBuilder->buildForm('rules_reaction_...', Object(Drupal\Core\Form\FormState)) #4 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #5 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #6 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/Render/Renderer.php(582): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #7 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #8 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #9 /var/www/vhosts/mydomain.org/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #10 /var/www/vhosts/mydomain.org/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #11 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #12 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #13 /var/www/vhosts/mydomain.org/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #14 /var/www/vhosts/mydomain.org/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #15 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #16 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #17 /var/www/vhosts/mydomain.org/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #18 /var/www/vhosts/mydomain.org/web/core/lib/Drupal/Core/DrupalKernel.php(693): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 /var/www/vhosts/mydomain.org/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #20 {main}.
Any ideas?