diff --git a/server.js b/server.js
index 11f1a93..b50797d 100644
--- a/server.js
+++ b/server.js
@@ -167,13 +167,17 @@ app.post('/csv', (req, res, next) => {
                     
 
                 });
+                let inserted_email = "";
                 readable.on("close", () => {
                     if(_res === ""){
                         var _data = `${_userData[0].mailadress},${_userData[0].name},${_userData[0].jsessionid},${_userData[0]._idp_session},${_userData[0]._opensaml_key},${_userData[0]._opensaml_value}\n`;
-                        fs.appendFile(path, _data, function (err) {
-                            if (err) throw err;
-                            console.log('The "data to append" was appended to file!');
-                        });
+                        if(inserted_email != _userData[0].mailadress){
+                            fs.appendFile(path, _data, function (err) {
+                                if (err) throw err;
+                                console.log('The "data to append" was appended to file!');
+                                inserted_email = _userData[0].mailadress;
+                            });
+                        }
                        // writetoFile(csv);
                         _res = _jsessionid;
                         res.send({'id': _res});