diff --git a/kernel/model/box.go b/kernel/model/box.go
index f19a89f25..6e5e0854a 100644
--- a/kernel/model/box.go
+++ b/kernel/model/box.go
@@ -547,6 +547,7 @@ func TryAccessFileByBlockID(id string) (ok bool) {
 }
 
 func getBoxesByPaths(paths []string) (ret map[string]*Box) {
+	ret = map[string]*Box{}
 	for _, p := range paths {
 		id := strings.TrimSuffix(path.Base(p), ".sy")
 		bt := treenode.GetBlockTree(id)
diff --git a/kernel/model/file.go b/kernel/model/file.go
index 6f5b07cc5..ca7554fab 100644
--- a/kernel/model/file.go
+++ b/kernel/model/file.go
@@ -1075,8 +1075,8 @@ func filterSelfChildDocs(paths []string) (ret []string) {
 	for _, fromPath := range paths {
 		dir := strings.TrimSuffix(fromPath, ".sy")
 		existParent := false
-		for _, d := range dirs {
-			if strings.HasPrefix(d, fromPath) {
+		for d, _ := range dirs {
+			if strings.HasPrefix(fromPath, d) {
 				existParent = true
 				break
 			}