PHP error: Deprecated function: strpos()

Problem/Motivation

Deprecated function: strpos(): Passing
null to parameter #1 ($haystack) of type string is deprecated in Drupal\Component\Utility\UrlHelper::stripDangerousProtocols() (line 408 of
/var/www/html/web/core/lib/Drupal/Component/Utility/UrlHelper.php)
#0 /var/www/html/web/core/includes/bootstrap.inc(104): _drupal_error_handler_real()
#1 [internal function]: _drupal_error_handler()
#2 /var/www/html/web/core/lib/Drupal/Component/Utility/UrlHelper.php(408): strpos()
#3 /var/www/html/web/core/lib/Drupal/Component/Render/FormattableMarkup.php(192): Drupal\Component\Utility\UrlHelper::stripDangerousProtocols()
#4 /var/www/html/web/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php(195):
Drupal\Component\Render\FormattableMarkup::placeholderFormat()
#5 /var/www/html/web/core/lib/Drupal/Component/Utility/ToStringTrait.php(15): Drupal\Core\StringTranslation\TranslatableMarkup->render()
#6 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(526): Drupal\Core\StringTranslation\TranslatableMarkup->__toString()
#7 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(230): Drupal\Core\Render\Renderer->doRender()
#8 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(501): Drupal\Core\Render\Renderer->render()
#9 /var/www/html/web/sites/default/files/php/twig/69a3785709b3c_form-element-label.html.t_avofEdksbU_m1wiYTxbDMKAmB/UW0sEJstjHc1LCwgBZmoobTHeuTjf_Ubws
XjMn5z82k.php(62): Drupal\Core\Template\TwigExtension->escapeFilter()
#10 /var/www/html/vendor/twig/twig/src/Template.php(402): __TwigTemplate_0396edd2fc126aa0c4121330b4502f24->doDisplay()
#11 /var/www/html/vendor/twig/twig/src/Template.php(386): Twig\Template->yield()
#12 /var/www/html/vendor/twig/twig/src/TemplateWrapper.php(51): Twig\Template->render()
#13 /var/www/html/web/core/lib/Drupal/Core/Template/TwigThemeEngine.php(35): Twig\TemplateWrapper->render()
#14 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(428): Drupal\Core\Template\TwigThemeEngine->renderTemplate()
#15 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(500): Drupal\Core\Theme\ThemeManager->render()
#16 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(230): Drupal\Core\Render\Renderer->doRender()
#17 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(501): Drupal\Core\Render\Renderer->render()
#18 /var/www/html/web/sites/default/files/php/twig/69a3785709b3c_form-element.html.twig_RLHcnJeQOnZd2ifJY0polRwR_/hC91ZTQNTeNfRDJtmvryc7SBPQ-Enq7Y8Xlt
QQPg5_Y.php(177): Drupal\Core\Template\TwigExtension->escapeFilter()
#19 /var/www/html/vendor/twig/twig/src/Template.php(402): __TwigTemplate_6348cbd67db80ef390110fefdafe6385->doDisplay()
#20 /var/www/html/vendor/twig/twig/src/Template.php(386): Twig\Template->yield()
#21 /var/www/html/vendor/twig/twig/src/TemplateWrapper.php(51): Twig\Template->render()
#22 /var/www/html/web/core/lib/Drupal/Core/Template/TwigThemeEngine.php(35): Twig\TemplateWrapper->render()
#23 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(428): Drupal\Core\Template\TwigThemeEngine->renderTemplate()
#24 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(556): Drupal\Core\Theme\ThemeManager->render()
#25 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(513): Drupal\Core\Render\Renderer->doRender()
#26 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(513): Drupal\Core\Render\Renderer->doRender()
#27 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(230): Drupal\Core\Render\Renderer->doRender()
#28 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(501): Drupal\Core\Render\Renderer->render()
#29 /var/www/html/web/sites/default/files/php/twig/69a3785709b3c_system-config-form.html.t_-uGt7h46BHwMit49rPIqHoib5/ZjyNTPjQMDfbSQvK38ZrAe-1UmllFTXO_
hmR_Ci60d8.php(51): Drupal\Core\Template\TwigExtension->escapeFilter()` and `TypeError: Drupal\Component\Utility\Html::escape(): Argument #1 ($text)
must be of type string, null given, called in /var/www/html/web/core/lib/Drupal/Component/Render/FormattableMarkup.php on line 202 in
Drupal\Component\Utility\Html::escape() (line 433 of /var/www/html/web/core/lib/Drupal/Component/Utility/Html.php).`

Steps to reproduce

Visit the module's admin page