diff --git a/core/modules/book/lib/Drupal/book/Access/BookNodeIsRemovableAccessCheck.php b/core/modules/book/lib/Drupal/book/Access/BookNodeIsRemovableAccessCheck.php
index c938748..6746168 100644
--- a/core/modules/book/lib/Drupal/book/Access/BookNodeIsRemovableAccessCheck.php
+++ b/core/modules/book/lib/Drupal/book/Access/BookNodeIsRemovableAccessCheck.php
@@ -28,9 +28,11 @@ public function applies(Route $route) {
    */
   public function access(Route $route, Request $request) {
     $node = $request->attributes->get('node');
-    $removable = (_book_node_is_removable($node) ? 'TRUE' : 'FALSE');
-    if ($removable != strtoupper($route->getRequirement('_book_node_is_removable'))) {
-      return FALSE;
+    if (!empty($node)) {
+      $removable = (_book_node_is_removable($node) ? 'TRUE' : 'FALSE');
+      if ($removable != strtoupper($route->getRequirement('_book_node_is_removable'))) {
+        return FALSE;
+      }
     }
   }
 }