diff --git a/lib/apiswagger.js b/lib/apiswagger.js
index c650659..fde03ec 100644
--- a/lib/apiswagger.js
+++ b/lib/apiswagger.js
@@ -499,7 +499,7 @@ module.exports = (app, client) => {
     *           application/octect-stream
     */
     app.use('/api/download_index', async (req, res) => {
-        if (req.params.instance && req.params.instance.length > 0) {
+        try {
             const result = await client.search({
                 index: constant.index,
                 size: 9999,
@@ -512,7 +512,8 @@ module.exports = (app, client) => {
                 'Content-disposition': 'attachment; filename=fediblock-index.json.gz'
             })
             result.pipe(zlib.createGzip()).pipe(res, { end: true })
-        } else {
+        } catch (e) {
+            console.error(e)
             res.status(404).end()
         }
     })