Message generated when I use Bot

[SaigoNoo]

plex@mymedia:/home/plex/Bot/ZeroTwo$ node index.js
bot ready
logged in as: ZeroTwo#5586
name: MyPlex
v: 1.24.3.5033-757abe6b4
(node:10427) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'voiceChannel' of null
    at playSong (/home/plex/Bot/ZeroTwo/commands/plex.js:116:33)
    at addToQueue (/home/plex/Bot/ZeroTwo/commands/plex.js:105:7)
    at /home/plex/Bot/ZeroTwo/commands/plex.js:62:7
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:10427) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:10427) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code

Sincerly Your,