Angular 5 with RxDB (idb adaptor) threws Uncaught TypeError: winningRev is not a function error when creating database

I am using Angualr Cli 1.6.5(Angular 5.2.0) with RxDB 7.3.2 and pouchdb-adapter-idb 6.4.2.

When I tried to create/connect to the database i am getting this errors:

zone.js:192 Uncaught TypeError: winningRev is not a function
    at insertDoc (index.es.js:370)
    at nextDoc (index.es.js:449)
    at eval (index.es.js:452)
    at Map.forEach (<anonymous>)
    at processDocs (index.es.js:426)
    at idbProcessDocs (index.es.js:330)
    at checkDone (index.es.js:354)
    at IDBRequest.readMetadata [as __zone_symbol__ON_PROPERTYsuccess] (index.es.js:364)
    at IDBRequest.wrapFn (zone.js:1166)
    at ZoneDelegate.invokeTask (zone.js:421)
index-browser.es.js:486 Database has a global failure DOMException: Uncaught exception in event handler.

This is the function i am calling from:

async getRxDB() {
    this.rx_db = await RxDB.create({
        name: 'testdb',
        adapter: 'idb',
        multiInstance: false
    });
    console.log(this.rx_db);

    await this.rx_db.collection({name: 'fork', schema: TestDBSchema});
}

The database schema:

const TestDBSchema = {
    'title': 'test schema',
    'version': 0,
    'description': 'describes a simple task',
    'type': 'object',
    'properties': {
      'name': {
          'type': 'string',
          'primary': true
      }
    }

};

and i simply called this function in a component as such:

constructor(private databaseService: DatabaseService) {}

ngOnInit() {
    this.databaseService.getRxDB();
}

I have searched on the internet but couldn't find a similar issue. Does any encounter this error with the similar settings?

Update The link @lossleader provide does work, thank

PouchDB 6.4.2 shipped with broken es modules due to a bug in the version of rollup it was transpiled with. (The transpiler bug removed the as Y from import X as Y syntax without renaming local X variables to prevent shadowing.)

PouchDB 6.4.3 has now been published to npm and was transpiled with rollup 0.55.1 which fixes the bug so updating should resolve the problem.