diff --git a/lib/apiswagger.js b/lib/apiswagger.js
index ef9c5ea..42a147e 100644
--- a/lib/apiswagger.js
+++ b/lib/apiswagger.js
@@ -461,6 +461,7 @@ module.exports = (app, client) => {
     */
     app.use('/api/block_count/:instance', async (req, res) => {
         if (req.params.instance && req.params.instance.length > 0) {
+            let block_count = 0
             const result = await client.search({
                 index: constant.index,
                 size: 9999,
@@ -476,7 +477,6 @@ module.exports = (app, client) => {
                 }
             }, { asStream: true, meta: false }),
                 instancescomment = [],
-                block_count = 0,
                 pipeline = chain([
                     parser(),
                     pick({ filter: 'hits.hits' }),