Meteor: Uncaught Error: Must be attached (delete function)

Question

I have an error in the console every time I'm deleting an item (List) in my Meteor application. The error in the console is:

domrange.js:337 Uncaught Error: Must be attached

Here is the function, I can't understand where come from this error:

Lists.js

Meteor.methods({
   'lists.remove'(listId) {
       check(listId, String);

       const list = Lists.findOne(listId);
       if (list.owner !== this.userId) {
           throw new Meteor.Error('not-authorized');
       }
       Tasks.remove({"listId": listId});
       Lists.remove(listId);
   },

All is working properly in the application but do you know where this error can come from ?

Ps: I'm using Blaze if it can help

thanks

Answer 1

It seems I found the solution adding a Meteor.isServer or better if (!this.isSimulation) (@MasterAM solution):

    'lists.remove'(listId) {
        check(listId, String);

        const list = Lists.findOne(listId);
        if (list.owner !== this.userId) {
            throw new Meteor.Error('not-authorized');
        }
        if (!this.isSimulation) {
            Tasks.remove({"listId": listId});
            Lists.remove(listId);
        }
    },

I edited the working code with the help of @MasterAM It'w working now! No Console error anymore.