Upgrade to 3.0.3

kirby/src/Cms/Page.php

@@ -510,6 +510,10 @@ class Page extends ModelWithContent
     public function is($page): bool
     {
         if (is_a($page, Page::class) === false) {
+            if (is_string($page) === false) {
+                return false;
+            }
+
             $page = $this->kirby()->page($page);
         }
 
@@ -757,7 +761,7 @@ class Page extends ModelWithContent
      */
     public function isUnlisted(): bool
     {
-        return $this->num() === null;
+        return $this->isListed() === false;
     }
 
     /**