Cannot read property 'whitelist' of undefined when importing ngrx dev tools : <p>Importing <a href="https://github.com/ngrx/store-devtools" rel="noreferrer">ngrx devtools</a> to enable a <strong>debugger</strong> for <strong>chrome</strong> tools results to an <strong>error</strong> below:</p>

<blockquote>
  <p>ERROR TypeError: Cannot read property 'whitelist' of undefined
      at isFiltered (:1:5016)
      at Object.x [as send] (:1:74196)
      at DevtoolsExtension.notify (store-devtools.js:210)
      at ScanSubscriber.StoreDevtools.liftedAction$.pipe.Object.state [as accumulator] (store-devtools.js:649)
      at ScanSubscriber._tryNext (scan.js:61)
      at ScanSubscriber._next (scan.js:54)
      at ScanSubscriber.Subscriber.next (Subscriber.js:54)
      at WithLatestFromSubscriber._next (withLatestFrom.js:66)
      at WithLatestFromSubscriber.Subscriber.next (Subscriber.js:54)
      at Notification.observe (Notification.js:15)</p>
</blockquote>

<p>This are my versions below of ngrx:</p>

<pre><code> "@ngrx/core": "^1.2.0",
    "@ngrx/effects": "^6.1.2",
    "@ngrx/store": "^6.1.2",
    "@ngrx/store-devtools": "^6.1.2",
</code></pre>

<p>and my <strong>angular</strong> and <strong>ionic</strong></p>

<pre><code> "@angular/animations": "5.2.11",
    "@angular/common": "5.2.11",
    "@angular/compiler": "5.2.11",
    "@angular/compiler-cli": "5.2.11",
    "@angular/core": "5.2.11",
    "@angular/forms": "5.2.11",
    "@angular/http": "5.2.11",
    "@angular/platform-browser": "5.2.11",
    "@angular/platform-browser-dynamic": "5.2.11",
    "@ionic-native/core": "~4.17.0",
    "@ionic-native/splash-screen": "~4.17.0",
    "@ionic-native/status-bar": "~4.17.0",
</code></pre>

<p>Whenever I try to import this code below on <strong>app.module</strong> is always shows the error that I displayed on top.</p>

<pre><code> StoreDevtoolsModule.instrument({
      maxAge: 15
    }),
</code></pre>

<p>The error on top refers to this line of code in my <strong>console</strong> on line <strong>210</strong></p>

<pre><code>this.extensionConnection.send(sanitizedAction, sanitizedState);
</code></pre>

<p>Appreciate if someone could help.
Thanks in advance.</p>
