diff --git a/app/src/main/java/io/legado/app/help/AppWebDav.kt b/app/src/main/java/io/legado/app/help/AppWebDav.kt
index fa71a6feea90..c97d1662527e 100644
--- a/app/src/main/java/io/legado/app/help/AppWebDav.kt
+++ b/app/src/main/java/io/legado/app/help/AppWebDav.kt
@@ -313,11 +313,10 @@ object AppWebDav {
         }
         appDb.bookDao.all.forEach { book ->
             val progressFileName = getProgressFileName(book.name, book.author)
-            val webDavFile = map[progressFileName]
-            webDavFile ?: return
+            val webDavFile = map[progressFileName] ?: return@forEach
             if (webDavFile.lastModify <= book.syncTime) {
                 //本地同步时间大于上传时间不用同步
-                return
+                return@forEach
             }
             getBookProgress(book)?.let { bookProgress ->
                 if (bookProgress.durChapterIndex > book.durChapterIndex