I integrated firebase crashlytics using below url and it was working fine. https://firebase.google.com/docs/crashlytics/get-started?authuser=0
Then I did git pull from other developer and went to build project and got following error:
Error:org.gradle.api.GradleException: Crashlytics Developer Tools error. Error:com.crashlytics.tools.android.exception.PluginException: Crashlytics Developer Tools error. Error:java.lang.IllegalArgumentException: Crashlytics found an invalid API key: null.