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callback is not a function error when using SyntheticMutator.update

See original GitHub issue

I’m following the Synthetic mutation example in the documentation. But whenever I call on SyntheticMutator.update(), I’m getting this error

/home/rj/.meteor/packages/cultofcoders_redis-oplog/.1.2.7_1.13z1z2p.8gfs++os+web.browser+web.cordova/npm/node_modules/redis/lib/utils.js:89
        callback(err, res);
        ^
TypeError: callback is not a function
    at Object.callbackOrEmit [as callback_or_emit] (/home/rj/.meteor/packages/cultofcoders_redis-oplog/.1.2.7_1.13z1z2p.8gfs++os+web.browser+web.cordova/npm/node_modules/redis/lib/utils.js:89:9)
    at RedisClient.return_error (/home/rj/.meteor/packages/cultofcoders_redis-oplog/.1.2.7_1.13z1z2p.8gfs++os+web.browser+web.cordova/npm/node_modules/redis/index.js:706:11)
    at JavascriptRedisParser.returnError (/home/rj/.meteor/packages/cultofcoders_redis-oplog/.1.2.7_1.13z1z2p.8gfs++os+web.browser+web.cordova/npm/node_modules/redis/index.js:196:18)
    at JavascriptRedisParser.execute (/home/rj/.meteor/packages/cultofcoders_redis-oplog/.1.2.7_1.13z1z2p.8gfs++os+web.browser+web.cordova/npm/node_modules/redis-parser/lib/parser.js:572:12)
    at Socket.<anonymous> (/home/rj/.meteor/packages/cultofcoders_redis-oplog/.1.2.7_1.13z1z2p.8gfs++os+web.browser+web.cordova/npm/node_modules/redis/index.js:274:27)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at addChunk (_stream_readable.js:263:12)
    at readableAddChunk (_stream_readable.js:250:11)
    at Socket.Readable.push (_stream_readable.js:208:10)
    at TCP.onread (net.js:597:20)
Exited with code: 1
Your application is crashing. Waiting for file change.