Argument 1 passed to _image_captcha_check_fonts() must be of the type array, null given

Problem/Motivation

TypeError: Argument 1 passed to _image_captcha_check_fonts() must be of the type array, null given, called in /var/www/html/drupal8/modules/captcha/image_captcha/image_captcha.module on line 213 in /var/www/html/drupal8/modules/captcha/image_captcha/image_captcha.module on line 115 #0 /var/www/html/drupal8/modules/captcha/image_captcha/image_captcha.module(213): _image_captcha_check_fonts(NULL)\n#1 /var/www/html/drupal8/modules/captcha/image_captcha/image_captcha.module(257): _image_captcha_check_setup()\n#2 [internal function]: image_captcha_captcha('list')\n#3 /var/www/html/drupal8/modules/captcha/src/Service/CaptchaService.php(37): call_user_func_array('image_captcha_c...', Array)\n#4 /var/www/html/drupal8/modules/captcha/src/Form/CaptchaSettingsForm.php(105): Drupal\\captcha\\Service\\CaptchaService->getAvailableChallengeTypes(false)\n#5 [internal function]: Drupal\\captcha\\Form\\CaptchaSettingsForm->buildForm(Array, Object(Drupal\\Core\\Form\\FormState))\n#6 /var/www/html/drupal8/core/lib/Drupal/Core/Form/FormBuilder.php(532): call_user_func_array(Array, Array)\n#7 /var/www/html/drupal8/core/lib/Drupal/Core/Form/FormBuilder.php(278): Drupal\\Core\\Form\\FormBuilder->retrieveForm('captcha_setting...', Object(Drupal\\Core\\Form\\FormState))\n#8 /var/www/html/drupal8/core/lib/Drupal/Core/Controller/FormController.php(91): Drupal\\Core\\Form\\FormBuilder->buildForm(Object(Drupal\\captcha\\Form\\CaptchaSettingsForm), Object(Drupal\\Core\\Form\\FormState))\n#9 [internal function]: Drupal\\Core\\Controller\\FormController->getContentResult(Object(Symfony\\Component\\HttpFoundation\\Request), Object(Drupal\\Core\\Routing\\RouteMatch))\n#10 /var/www/html/drupal8/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)\n#11 /var/www/html/drupal8/core/lib/Drupal/Core/Render/Renderer.php(573): Drupal\\Core\\EventSubscriber\\EarlyRenderingControllerWrapperSubscriber->Drupal\\Core\\EventSubscriber\\{closure}()\n#12 /var/www/html/drupal8/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\\Core\\Render\\Renderer->executeInRenderContext(Object(Drupal\\Core\\Render\\RenderContext), Object(Closure))\n#13 /var/www/html/drupal8/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\\Core\\EventSubscriber\\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)\n#14 /var/www/html/drupal8/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\\Core\\EventSubscriber\\EarlyRenderingControllerWrapperSubscriber->Drupal\\Core\\EventSubscriber\\{closure}()\n#15 /var/www/html/drupal8/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\\Component\\HttpKernel\\HttpKernel->handleRaw(Object(Symfony\\Component\\HttpFoundation\\Request), 1)\n#16 /var/www/html/drupal8/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\\Component\\HttpKernel\\HttpKernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#17 /var/www/html/drupal8/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\\Core\\StackMiddleware\\Session->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#18 /var/www/html/drupal8/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\\Core\\StackMiddleware\\KernelPreHandle->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#19 /var/www/html/drupal8/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\\page_cache\\StackMiddleware\\PageCache->pass(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#20 /var/www/html/drupal8/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\\page_cache\\StackMiddleware\\PageCache->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#21 /var/www/html/drupal8/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\\Core\\StackMiddleware\\ReverseProxyMiddleware->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#22 /var/www/html/drupal8/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\\Core\\StackMiddleware\\NegotiationMiddleware->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#23 /var/www/html/drupal8/core/lib/Drupal/Core/DrupalKernel.php(708): Stack\\StackedHttpKernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#24 /var/www/html/drupal8/index.php(19): Drupal\\Core\\DrupalKernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request))\n#25 {main},

Drupal 8.9.14, captcha 8.x-1.2, php 7.3
I'm not sure since when this started to happening.

Steps to reproduce

Browse to /admin/config/people/captcha