diff --git a/kernel/model/file.go b/kernel/model/file.go
index e6b48d09f..8bacdb3a7 100644
--- a/kernel/model/file.go
+++ b/kernel/model/file.go
@@ -1031,7 +1031,8 @@ func MoveDoc(fromBoxID, fromPath, toBoxID, toPath string) (newPath string, err e
 func MoveDocs(fromPaths []string, toPath string) (err error) {
 	util.PushEndlessProgress(Conf.Language(116))
 
-	fromPaths = filterFromPaths(fromPaths, toPath)
+	WaitForWritingFiles()
+	fromPaths = util.FilterFromPaths(fromPaths, toPath)
 	pathsBoxes := getBoxesByPaths(fromPaths)
 
 	toID := strings.TrimSuffix(path.Base(toPath), ".sy")
@@ -1062,34 +1063,6 @@ func MoveDocs(fromPaths []string, toPath string) (err error) {
 	return
 }
 
-func filterFromPaths(fromPaths []string, toPath string) (retFromPaths []string) {
-	fromPaths = append(fromPaths, toPath)
-	retFromPaths = filterSelfChildDocs(fromPaths)
-	return
-}
-
-func filterSelfChildDocs(paths []string) (ret []string) {
-	sort.Slice(paths, func(i, j int) bool { return len(paths[i]) < len(paths[j]) })
-
-	dirs := map[string]string{}
-	for _, fromPath := range paths {
-		dir := strings.TrimSuffix(fromPath, ".sy")
-		existParent := false
-		for d, _ := range dirs {
-			if strings.HasPrefix(fromPath, d) {
-				existParent = true
-				break
-			}
-		}
-		if existParent {
-			continue
-		}
-		dirs[dir] = fromPath
-		ret = append(ret, fromPath)
-	}
-	return
-}
-
 func moveDoc(fromBox *Box, fromPath string, toBox *Box, toPath string) (newPath string, err error) {
 	isSameBox := fromBox.ID == toBox.ID
 
@@ -1217,7 +1190,7 @@ func RemoveDoc(boxID, p string) (err error) {
 func RemoveDocs(paths []string) (err error) {
 	util.PushEndlessProgress(Conf.Language(116))
 
-	paths = filterSelfChildDocs(paths)
+	paths = util.FilterSelfChildDocs(paths)
 	pathsBoxes := getBoxesByPaths(paths)
 	WaitForWritingFiles()
 	for p, box := range pathsBoxes {
diff --git a/kernel/util/path.go b/kernel/util/path.go
index 5b290f151..c05f1f517 100644
--- a/kernel/util/path.go
+++ b/kernel/util/path.go
@@ -22,6 +22,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"sort"
 	"strings"
 	"time"
 
@@ -173,3 +174,31 @@ func NormalizeEndpoint(endpoint string) string {
 	}
 	return endpoint
 }
+
+func FilterFromPaths(fromPaths []string, toPath string) (retFromPaths []string) {
+	fromPaths = append(fromPaths, toPath)
+	retFromPaths = FilterSelfChildDocs(fromPaths)
+	return
+}
+
+func FilterSelfChildDocs(paths []string) (ret []string) {
+	sort.Slice(paths, func(i, j int) bool { return len(paths[i]) < len(paths[j]) })
+
+	dirs := map[string]string{}
+	for _, fromPath := range paths {
+		dir := strings.TrimSuffix(fromPath, ".sy")
+		existParent := false
+		for d, _ := range dirs {
+			if strings.HasPrefix(fromPath, d) {
+				existParent = true
+				break
+			}
+		}
+		if existParent {
+			continue
+		}
+		dirs[dir] = fromPath
+		ret = append(ret, fromPath)
+	}
+	return
+}