Resolv 'push' of undefined error when calling client.list()

[LM1LC3N7]

Resolve the following error when using the command client.list():

node_modules/irc/lib/irc.js:849
                        throw err;
                        ^
TypeError: Cannot read property 'push' of undefined
    at Client.<anonymous> (/[...]/node_modules/irc/lib/irc.js:449:33)