Problems adding Firebase Crashlytics to Android project - Crashlytics found an invalid API key: null : <p>I am trying to add Firebase crashlytics to our project but just can not get it to work. </p>

<p>I have followed the <a href="https://firebase.google.com/docs/crashlytics/get-started?authuser=0" rel="noreferrer">instructions</a> adding the necessary lines to our gradle file but no success so far.</p>

<p>The main issue I get is this message:
Crashlytics found an invalid API key: null</p>

<p>which seems weird since I thought an API key should not be needed for Firebase.</p>

<p>I use Android studio 3.0.1 with the latest gradle plugin. My project is Ionic based but I have tried to hand modify the gradle file as well with the same results.</p>
