All of a sudden started to get an error saying TypeError: Cannot set property '_original' of null about mongoose-patch-history HOT 7 CLOSED

    const mongoose = require('mongoose');
    const Schema = mongoose.Schema;
    const patchHistory = require('mongoose-patch-history').default;
 
    const PostSchema = new Schema({
        _id: { type: String },
        title: { type: String, required: true },
        comments: Array
    }, {_id:false});
 
    PostSchema.plugin(patchHistory, { mongoose, name: 'postPatches' });
 
    const Post = mongoose.model('Post', PostSchema);
    let post= await Post.create({_id: "post", title:"first", comments:["ok"]});
    console.log('Ok', post);
 
    post= await Post.findOneAndUpdate({_id:"inexistence"}, {title:"new", comments:["fine"]});
    console.log(post);
/*
    Ok { comments: [ 'ok' ], _id: 'post', title: 'first', __v: 0 }
    2018-06-01T14:03:26.169Z - error: Unhandled Rejection at: Promise [object Promise] - reason ==> TypeError: Cannot set property '_original' of null
    at C:\examples\node_modules\mongoose-patch-history\lib\index.js:193:21
    at tryCatcher (C:\examples\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (C:\examples\node_modules\bluebird\js\release\promise.js:512:31)
...
*/

  schema.post('findOneAndUpdate', function (doc, next) {
    if(!doc) next();  //<-- here
    if (!this.options.new) {
      return postUpdateOne.call(this, {}, next);
    }