diff --git a/src/Entries/Entry.php b/src/Entries/Entry.php
index 406cd62d75a..1340ff4a70f 100644
--- a/src/Entries/Entry.php
+++ b/src/Entries/Entry.php
@@ -528,10 +528,13 @@ public function order()
             return $this->value('order');
         }
 
-        return $this->structure()->in($this->locale())
+        $order = $this->structure()->in($this->locale())
             ->flattenedPages()
             ->map->reference()
-            ->flip()->get($this->id) + 1;
+            ->filter()
+            ->flip()->get($this->id);
+
+        return $order !== null ? $order + 1 : null;
     }
 
     public function template($template = null)