Call to a member function hasField() on null

[scottsawyer]

Given a URL like /products/industrial-vacuum-cleaners/f/cfm/over-250/product-category/soot-collection/vacuum-type/[back] it can throw an error

Error: Call to a member function hasField() on null in Drupal\facets_hardcode\FacetsHardcodeSlugHelper::getSlugFromValue() (line 53 of /code/web/modules/contrib/facets_hardcode/src/FacetsHardcodeSlugHelper.php).

Backtrace

#0 /code/web/modules/contrib/facets_hardcode/src/FacetsHardcodePathHelper.php(156): Drupal\facets_hardcode\FacetsHardcodeSlugHelper::getSlugFromValue('vacuum-type', '[back]')
#1 /code/web/modules/contrib/facets_hardcode/src/Plugin/facets/url_processor/FacetsHardcodeUrlProcessor.php(90): Drupal\facets_hardcode\FacetsHardcodePathHelper::updateFilterString(Object(Drupal\facets\Entity\Facet), Object(Drupal\facets\Result\Result), '/industrial-vac...')
#2 /code/web/modules/contrib/facets/src/Plugin/facets/processor/UrlProcessorHandler.php(76): Drupal\facets_hardcode\Plugin\facets\url_processor\FacetsHardcodeUrlProcessor->buildUrls(Object(Drupal\facets\Entity\Facet), Array)

FacetsHardcodeSlugHelper::getSlugFromValue doesn't properly check if an entity is found before attempting to generate the slug.