diff --git a/kernel/filesys/tree.go b/kernel/filesys/tree.go
index d1b69d144..2ebe84275 100644
--- a/kernel/filesys/tree.go
+++ b/kernel/filesys/tree.go
@@ -242,12 +242,13 @@ func prepareWriteTree(tree *parse.Tree) (data []byte, filePath string, err error
 	tree.Root.SetIALAttr("type", "doc")
 	renderer := render.NewJSONRenderer(tree, luteEngine.RenderOptions)
 	data = renderer.Render()
-	data = bytes.ReplaceAll(data, []byte("\\u0000"), []byte(""))
+	data = bytes.ReplaceAll(data, []byte("\u0000"), []byte(""))
 
 	if !util.UseSingleLineSave {
 		buf := bytes.Buffer{}
 		buf.Grow(1024 * 1024 * 2)
 		if err = json.Indent(&buf, data, "", "\t"); err != nil {
+			logging.LogErrorf("json indent failed: %s", err)
 			return
 		}
 		data = buf.Bytes()