Why is an exception thrown when calling a method?

Question

MongoDB

Good afternoon
The following method adds additional information for the user to the database upon registration

Accounts.onCreateUser(function(options, user) {
    if(!options || !user) {
        console.log('error creating user');
        return;
    } else {
        if(options.profile) {user.profile = options.profile;}
        user.rateELO=100;
        user.rateCombine=1;
        user.battleCount=0;
        user.winPercent=0.00;
    }
    return user;
});

After adding it, the Meteor server began to throw out an action with the following content

I20151109-14:51:36.022(3)? Exception from sub battles id 7L2jjjuZyai6Ko9h9 TypeError: Object [object Object] has no method 'user'
I20151109-14:51:36.023(3)?     at [object Object].Accounts.onCreateUser.user.profile [as _handler] (server/Publish.js:25:1)
I20151109-14:51:36.023(3)?     at maybeAuditArgumentChecks (livedata_server.js:1698:12)
I20151109-14:51:36.024(3)?     at [object Object]._.extend._runHandler (livedata_server.js:1023:17)
I20151109-14:51:36.024(3)?     at [object Object]._.extend._startSubscription (livedata_server.js:842:9)
I20151109-14:51:36.024(3)?     at [object Object]._.extend.protocol_handlers.sub (livedata_server.js:614:12)
I20151109-14:51:36.024(3)?     at livedata_server.js:548:43
I20151109-14:53:36.411(3)? Exception from sub battles id urKhdT94eF75a4ssC TypeError: Object [object Object] has no method 'user'
I20151109-14:53:36.411(3)?     at [object Object].Accounts.onCreateUser.user.profile [as _handler] (server/Publish.js:25:1)
I20151109-14:53:36.411(3)?     at maybeAuditArgumentChecks (livedata_server.js:1698:12)
I20151109-14:53:36.412(3)?     at [object Object]._.extend._runHandler (livedata_server.js:1023:17)
I20151109-14:53:36.412(3)?     at [object Object]._.extend._startSubscription (livedata_server.js:842:9)
I20151109-14:53:36.412(3)?     at [object Object]._.extend.protocol_handlers.sub (livedata_server.js:614:12)
I20151109-14:53:36.412(3)?     at livedata_server.js:548:43

The method is used 1 time. As I can understand, the method is referenced in the description of the exception.
What is the error and how to fix it?

Answer 1

In your previous question, in the publication you have a piece of code:
this.user () - there is no such method, so it swears