diff --git a/kernel/treenode/blocktree.go b/kernel/treenode/blocktree.go
index 10cf2bb3f..aa8834207 100644
--- a/kernel/treenode/blocktree.go
+++ b/kernel/treenode/blocktree.go
@@ -306,6 +306,10 @@ func ExistBlockTree(id string) bool {
 
 func ExistBlockTrees(ids []string) (ret map[string]bool) {
 	ret = map[string]bool{}
+	if 1 > len(ids) {
+		return
+	}
+
 	for _, id := range ids {
 		ret[id] = false
 	}
@@ -330,6 +334,10 @@ func ExistBlockTrees(ids []string) (ret map[string]bool) {
 
 func GetBlockTrees(ids []string) (ret map[string]*BlockTree) {
 	ret = map[string]*BlockTree{}
+	if 1 > len(ids) {
+		return
+	}
+
 	sqlStmt := "SELECT * FROM blocktrees WHERE id IN ('" + strings.Join(ids, "','") + "')"
 	rows, err := db.Query(sqlStmt)
 	if nil != err {