Warning: array_key_exists(): The first argument should be either a string or an integer in Drupal\Core\Path\AliasWhitelist->get() (line 120 of /public_html/web/core/lib/Drupal/Core/Path/AliasWhitelist.php)

#0 /public_html/web/core/includes/bootstrap.inc(600): _drupal_error_handler_real(2, 'array_key_exist...', '/public_html...', 120, Array)
#1 [internal function]: _drupal_error_handler(2, 'array_key_exist...', '/public_html...', 120, Array)
#2 /public_html/web/core/lib/Drupal/Core/Path/AliasWhitelist.php(120): array_key_exists(false, Array)
#3 /public_html/web/core/lib/Drupal/Core/Path/AliasManager.php(240): Drupal\Core\Path\AliasWhitelist->get(false)
#4 /public_html/web/modules/contrib/protected_pages/src/EventSubscriber/ProtectedPagesSubscriber.php(119): Drupal\Core\Path\AliasManager->getAliasByPath('//')
#5 [internal function]: Drupal\protected_pages\EventSubscriber\ProtectedPagesSubscriber->checkProtectedPage(Object(Symfony\Component\HttpKernel\Event\FilterResponseEvent), 'kernel.response', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#6 /public_html/web/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(111): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\FilterResponseEvent), 'kernel.response', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#7 /public_html/vendor/symfony/http-kernel/HttpKernel.php(191): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.response', Object(Symfony\Component\HttpKernel\Event\FilterResponseEvent))
#8 /public_html/vendor/symfony/http-kernel/HttpKernel.php(130): Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object(Drupal\Core\Cache\CacheableRedirectResponse), Object(Symfony\Component\HttpFoundation\Request), 1)
#9 /public_html/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#10 /public_html/web/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#11 /public_html/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#12 /public_html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(191): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#13 /public_html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(128): Drupal\page_cache\StackMiddleware\PageCache->fetch(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#14 /public_html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(82): Drupal\page_cache\StackMiddleware\PageCache->lookup(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#15 /public_html/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#16 /public_html/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#17 /public_html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#18 /public_html/web/core/lib/Drupal/Core/DrupalKernel.php(708): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#19 /public_html/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#20 {main}