NightBot $(URLfetch) Error on Unicode name

Hello guys!
I need a help, I have made point system. It works good, but when it comes to viewer's name contains Unicode character, it returns "​Error Connecting To Remote Server".

here is my command : $(urlfetch json http://xxxxxxxxxxx/points?id=$(userid)&name=$(user))
and here is my code in my backend 🙂

app.get('/points', async (req, res) => {
  let userId = req.query.id;
  let userName = req.query.name.toString();
  //console.log(userName);
​
  const rndCoins = await updateData(userId, userName);
  const userDetails0 = await getUserPoints(userId);
​
  const numinString = intToString(userDetails.points);
​
    res.send("Congrats!! 😁 " + userName + " you got +" + rndPoints + " points😳 Your total points are " + numinString );
​
  }
});

Please help me.