Sequelize model crashes on .get?

Question

Node.js

Hello. Why does it crash when using the Sequelize model.get() library method?

TypeError: instance.get is not a function
at dataValues.(anonymous function).map.instance (D:\Programming\NodeJS\ozzgame2\node_modules\sequelize\lib\model.js:3116:64)
at Array.map (native)
at model.get (D:\Programming\NodeJS\ozzgame2\node_modules\sequelize\lib\model.js:3116:39)
at model.get (D:\Programming\NodeJS\ozzgame2\node_modules\sequelize\lib\model.js:3140:31)
at game.model.save.then (D:\Programming\NodeJS\ozzgame2\modules\coinflip.js:139:32)
at tryCatcher (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\util.js:16:23)
at Promise._settlePromiseFromHandler (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\promise.js:512:31)
at Promise._settlePromise (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\promise.js:569:18)
at Promise._settlePromise0 (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\promise.js:614:10)
at Promise._settlePromises (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\promise.js:693:18)
at Async._drainQueue (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\async.js:133:16)
at Async._drainQueues (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\async.js:143:10)
at Immediate.Async.drainQueues (D:\Programming\NodeJS\ozzgame2\node_modules\bluebird\js\release\async.js:17:14)
at runCallback (timers.js:800:20)
at tryOnImmediate (timers.js:762:5)
at processImmediate [as _immediateCallback] (timers.js:733:5)

Call code:

game.model.save().then(() => {
                            currentGames[game.model.id] = game;

                            callback(null, {
                                roundInfo: game.model.get({ plain: true })   });
                        }, err => callback(err));

"game" is loaded like this:

for(let currentGameKey in currentGames) {
        if(!currentGames.hasOwnProperty(currentGameKey)) continue;
        if(gameId == currentGameKey) {
            continuation(currentGames[currentGameKey], false);
            break;
        }
    }