/home/matt/Documents/programming/node/discord/hopson_bot/src/commands/role_command_handler.js:108
                member.addRole(role)
                       ^

TypeError: Cannot read property 'addRole' of null
    at modifyRoles (/home/matt/Documents/programming/node/discord/hopson_bot/src/commands/role_command_handler.js:108:24)
    at Comamnd.addRoles [as action] (/home/matt/Documents/programming/node/discord/hopson_bot/src/commands/role_command_handler.js:83:5)
    at RoleEventHandler.handleCommand (/home/matt/Documents/programming/node/discord/hopson_bot/src/commands/command_handler.js:40:17)
    at MessageSentHandler.handleCommand (/home/matt/Documents/programming/node/discord/hopson_bot/src/events/message_sent_handler.js:80:25)
    at MessageSentHandler.handleMessageSent (/home/matt/Documents/programming/node/discord/hopson_bot/src/events/message_sent_handler.js:46:18)
    at Client.client.on.message (/home/matt/Documents/programming/node/discord/hopson_bot/src/hopson_bot.js:29:37)
    at Client.emit (events.js:182:13)
    at MessageCreateHandler.handle (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/discord.js/src/client/websocket/packets/handlers/MessageCreate.js:9:34)
    at WebSocketPacketManager.handle (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/discord.js/src/client/websocket/packets/WebSocketPacketManager.js:103:65)
    at WebSocketConnection.onPacket (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/discord.js/src/client/websocket/WebSocketConnection.js:333:35)
    at WebSocketConnection.onMessage (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/discord.js/src/client/websocket/WebSocketConnection.js:296:17)
    at WebSocket.onMessage (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/ws/lib/event-target.js:120:16)
    at WebSocket.emit (events.js:182:13)
    at Receiver._receiver.onmessage (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/ws/lib/websocket.js:137:47)
    at Receiver.dataMessage (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/ws/lib/receiver.js:409:14)
    at Receiver.getData (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/ws/lib/receiver.js:347:12)
    at Receiver.startLoop (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/ws/lib/receiver.js:143:16)
    at Receiver.add (/home/matt/Documents/programming/node/discord/hopson_bot/node_modules/ws/lib/receiver.js:117:10)
    at TLSSocket.emit (events.js:182:13)
    at addChunk (_stream_readable.js:283:12)
    at readableAddChunk (_stream_readable.js:264:11)
    at TLSSocket.Readable.push (_stream_readable.js:219:10)