diff --git a/triedb/hashdb/database.go b/triedb/hashdb/database.go
index e45ccdba32..7d5499eb69 100644
--- a/triedb/hashdb/database.go
+++ b/triedb/hashdb/database.go
@@ -619,7 +619,6 @@ func (db *Database) Size() (common.StorageSize, common.StorageSize) {
 func (db *Database) Close() error {
 	if db.cleans != nil {
 		db.cleans.Reset()
-		db.cleans = nil
 	}
 	return nil
 }