diff --git a/plugins/src/main/java/org/tron/plugins/DbQuery.java b/plugins/src/main/java/org/tron/plugins/DbQuery.java
index b7b62b09e92..dc393a4fb33 100644
--- a/plugins/src/main/java/org/tron/plugins/DbQuery.java
+++ b/plugins/src/main/java/org/tron/plugins/DbQuery.java
@@ -84,7 +84,7 @@ private  void print(byte[] k, byte[] b) {
       dbName = this.db.getFileName().toString();
     }
     String key = ByteArray.toHexString(k);
-    if (b.length == 0) {
+    if (b == null || b.length == 0) {
       spec.commandLine().getOut().format("%s\t%s", dbName, key).println();
       logger.info("{}\t{}", dbName, key);
     } else {