Onboarding IllegalStateException

[FHellmann]

Describe the bug
For some devices, the onboarding crashes with an IllegalStateException:

Caused by: java.lang.IllegalStateException: 
  at android.app.Activity.onCreate (Activity.java:1038)
  at android.support.v4.app.SupportActivity.onCreate (SupportActivity.java)
  at android.support.v4.app.FragmentActivity.onCreate (FragmentActivity.java:6)
  at android.support.v7.app.AppCompatActivity.onCreate (AppCompatActivity.java:42)
  at com.heinrichreimersoftware.materialintro.app.IntroActivity.onCreate (IntroActivity.java)
  at com.edu.uni.augsburg.uniatron.ui.onboarding.OnBoardingActivity.onCreate (OnBoardingActivity.java:4)
  at android.app.Activity.performCreate (Activity.java:7174)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1220)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2910)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3032)
  at android.app.ActivityThread.-wrap11 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1696)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6944)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

Smartphones:

• Samsung Galaxy A5 (2017), Android 8.0.0, Version Code 6
• Huawai P20 Lite, Android 8.0.0, Version Code 6