Exception java.lang.RuntimeException:
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:4049)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:4236)
  at android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:112)
  at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem (TransactionExecutor.java:174)
  at android.app.servertransaction.TransactionExecutor.executeTransactionItems (TransactionExecutor.java:109)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:81)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2637)
  at android.os.Handler.dispatchMessage (Handler.java:107)
  at android.os.Looper.loopOnce (Looper.java:232)
  at android.os.Looper.loop (Looper.java:317)
  at android.app.ActivityThread.main (ActivityThread.java:8751)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:580)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:892)
Caused by java.lang.NullPointerException: run(...) must not be null
  at com.nextcloud.talk.utils.BitmapShrinker.decodeBitmap (BitmapShrinker.kt:31)
  at com.nextcloud.talk.utils.BitmapShrinker.shrinkBitmap (BitmapShrinker.kt:25)
  at com.nextcloud.talk.fullscreenfile.FullScreenImageActivity.displayImage (FullScreenImageActivity.kt:143)
  at com.nextcloud.talk.fullscreenfile.FullScreenImageActivity.onCreate (FullScreenImageActivity.kt:134)
  at android.app.Activity.performCreate (Activity.java:9002)
  at android.app.Activity.performCreate (Activity.java:8980)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1527)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:4031)