Cannot read properties of undefined (reading 'includes')

[parashorea]

file:///home/ubuntu/WoW-Server-Relay-main/RelayServer.js:77
socket.remoteAddress.includes("::ffff:")
^

TypeError: Cannot read properties of undefined (reading 'includes')
at Server. (file:///home/ubuntu/WoW-Server-Relay-main/RelayServer.js:77:34)
at Server.emit (node:events:518:28)
at TCP.onconnection (node:net:2227:8)

Node.js v20.18.1