diff --git a/app/Http/Controllers/Bo/DocumentController.php b/app/Http/Controllers/Bo/DocumentController.php
index d2a19b7..9129547 100644
--- a/app/Http/Controllers/Bo/DocumentController.php
+++ b/app/Http/Controllers/Bo/DocumentController.php
@@ -171,6 +171,7 @@ class DocumentController extends Controller
      */
     public function destroy(Document $document)
     {
+        $document->tags()->sync([]);
         foreach ($document->children as $documentChild) {
             Document::removeDocument($documentChild);
             $documentChild->deleteOrFail();