WebRTC Call throwing a error during hangup - node.js

Question

I am implementing a peer-2-peer call with WebRTC but I have encountered an error when leaving the call.
The connection is gone through but when I leave I get an error
The error is saying
connect.otherUser = null;
^
TypeError: Cannot set property 'otherUser' of undefined
This is the server.js
var webSocketServ = require('ws').Server;
var wss = new webSocketServ({
port: 9090
})
var users = {};
var otherUser;
wss.on('connection', function (conn) {
console.log("User connected");
conn.on('message', function (message) {
var data;
try {
data = JSON.parse(message);
} catch (e) {
console.log("Invalid JSON");
data = {};
}
switch (data.type) {
case "login":
if (users[data.name]) {
sendToOtherUser(conn, {
type: "login",
success: false
})
} else {
users[data.name] = conn;
conn.name = data.name
sendToOtherUser(conn, {
type: "login",
success: true
})
}
break;
case "offer":
var connect = users[data.name];
if (connect != null) {
conn.otherUser = data.name;
sendToOtherUser(connect, {
type: "offer",
offer: data.offer,
name: conn.name
})
}
break;
case "answer":
var connect = users[data.name];
if (connect != null) {
conn.otherUser = data.name
sendToOtherUser(connect, {
type: "answer",
answer: data.answer
})
}
break
case "candidate":
var connect = users[data.name];
if (connect != null) {
sendToOtherUser(connect, {
type: "candidate",
candidate: data.candidate
})
}
break;
case "reject":
var connect = users[data.name];
if (connect != null) {
sendToOtherUser(connect, {
type: "reject",
name: conn.name
})
}
break;
case "accept":
var connect = users[data.name];
if (connect != null) {
sendToOtherUser(connect, {
type: "accept",
name: conn.name
})
}
break;
case "leave":
var connect = users[data.name];
connect.otherUser = null;
if (connect != null) {
sendToOtherUser(connect, {
type: "leave"
})
}
break;
default:
sendToOtherUser(conn, {
type: "error",
message: "Command not found: " + data.type
});
break;
}
})
conn.on('close', function () {
console.log('Connection closed');
if(conn.name){
delete users[conn.name];
if(conn.otherUser){
var connect = users[conn.otherUser];
conn.otherUser = null;
if(conn != null){
sendToOtherUser(connect, {
type:"leave"
});
}
}
}
})
conn.send("Hello World");
});
function sendToOtherUser(connection, message) {
connection.send(JSON.stringify(message))
}
Also var otherUser; is declared but its value is never read
I don't know why there is an error when leaving the call