diff --git a/kernel/model/sync.go b/kernel/model/sync.go
index 20be7c92e..a8c041462 100644
--- a/kernel/model/sync.go
+++ b/kernel/model/sync.go
@@ -279,6 +279,13 @@ func incReindex(upserts, removes []string) (upsertRootIDs, removeRootIDs []strin
 	util.IncBootProgress(3, "Sync reindexing...")
 	removeRootIDs = removeIndexes(removes) // 先执行 remove，否则移动文档时 upsert 会被忽略，导致未被索引
 	upsertRootIDs = upsertIndexes(upserts)
+
+	if 1 > len(removeRootIDs) {
+		removeRootIDs = []string{}
+	}
+	if 1 > len(upsertRootIDs) {
+		upsertRootIDs = []string{}
+	}
 	return
 }
 
@@ -301,6 +308,10 @@ func removeIndexes(removeFilePaths []string) (removeRootIDs []string) {
 			sql.RemoveTreeQueue(block.BoxID, block.RootID)
 		}
 	}
+
+	if 1 > len(removeRootIDs) {
+		removeRootIDs = []string{}
+	}
 	return
 }
 
@@ -336,6 +347,10 @@ func upsertIndexes(upsertFilePaths []string) (upsertRootIDs []string) {
 		sql.UpsertTreeQueue(tree)
 		upsertRootIDs = append(upsertRootIDs, tree.Root.ID)
 	}
+
+	if 1 > len(upsertRootIDs) {
+		upsertRootIDs = []string{}
+	}
 	return
 }