diff --git a/server.js b/server.js
index ea64aa2..926c9ff 100644
--- a/server.js
+++ b/server.js
@@ -169,7 +169,7 @@ app.post('/csv', (req, res, next) => {
                 });
                 readable.on("close", () => {
                     if(_res === ""){
-                        converter.json2csv(userData, { header: false }, (err, less_csv) {
+                        converter.json2csv(userData, { header: false }, (err, less_csv) => {
                             console("--- csvs ---", less_csv);
                             fs.appendFile(path, less_csv, function (err) {
                                 if (err) throw err;