diff --git a/src/Entity/Access/GroupLatestRevisionCheck.php b/src/Entity/Access/GroupLatestRevisionCheck.php
index 818ed6a..528221d 100644
--- a/src/Entity/Access/GroupLatestRevisionCheck.php
+++ b/src/Entity/Access/GroupLatestRevisionCheck.php
@@ -71,6 +71,9 @@ class GroupLatestRevisionCheck implements AccessInterface {
     /** @var \Drupal\group\Entity\GroupInterface $group */
     $group = $route_match->getParameter('group');
 
+    if (!$group instanceof GroupInterface) {
+      return AccessResult::neutral();
+    }
     // This tab should not show up unless there's a reason to show it.
     if (!$this->moderationInfo->hasPendingRevision($group)) {
       return AccessResult::forbidden('No pending revision for this group.')->addCacheableDependency($group);