diff --git a/src/EasyBreadcrumbBuilder.php b/src/EasyBreadcrumbBuilder.php
index 304d57e..8bd6922 100644
--- a/src/EasyBreadcrumbBuilder.php
+++ b/src/EasyBreadcrumbBuilder.php
@@ -339,8 +339,8 @@ class EasyBreadcrumbBuilder implements BreadcrumbBuilderInterface {
    * @param array $replacedTitles
    *
    *
-   * @return string | FALSE
-   *   Either the current title string or FALSE if unable to determine it.
+   * @return string | NULL
+   *   Either the current title string or NULL if unable to determine it.
    */
   public function getTitleString(Request $route_request, RouteMatchInterface $route_match, array $replacedTitles) {
     $title = $this->titleResolver->getTitle($route_request, $route_match->getRouteObject());
@@ -362,10 +362,10 @@ class EasyBreadcrumbBuilder implements BreadcrumbBuilderInterface {
       $title = Xss::filter($title['#markup'], $tags);
     }
 
-    // If a route declares the title in an unexpected way log and return FALSE.
+    // If a route declares the title in an unexpected way, log and return NULL.
     if (!is_string($title)) {
       \Drupal::logger('easy_breadcrumb')->notice('Easy Breadcrumb could not determine the title to use for @path', ['@path' => $route_match->getRouteObject()->getPath()]);
-      return FALSE;
+      return NULL;
     }
     return $title;
   }