Upvoting and downvoting causes NodeBB crash / restart

btc

NodeJS - 6.11.1
NodeBB - 1.5.2
NPM - 5.3.0
Redis - 4.0.0
CentOS - 6.9

As per the title, voting on a post causes a crash. Browser error is the "connection lost, please wait while we reconnect" one.

Error in logs is:

24/7 12:50:30 [12789] - error: TypeError: callback is not a function
at Command.callback (/usr/bin/nodebb/src/database/redis/sorted.js:184:4)
at normal_reply (/usr/bin/nodebb/node_modules/redis/index.js:721:21)
at RedisClient.return_reply (/usr/bin/nodebb/node_modules/redis/index.js:819:9)
at JavascriptRedisParser.returnReply (/usr/bin/nodebb/node_modules/redis/index.js:192:18)
at JavascriptRedisParser.execute (/usr/bin/nodebb/node_modules/redis-parser/lib/parser.js:574:12)
at Socket.<anonymous> (/usr/bin/nodebb/node_modules/redis/index.js:274:27)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at TCP.onread (net.js:547:20)