crash on tryCollapseTimeline

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void flussonic.watcher.sdk.presentation.timeline.FlussonicTimelineView.collapse()' on a null object reference
       at flussonic.watcher.sdk.presentation.watcher.FlussonicWatcherView.lambda$tryCollapseTimeline$2(FlussonicWatcherView.java:582)
       at flussonic.watcher.sdk.presentation.watcher.-$$Lambda$FlussonicWatcherView$kfbfhYsS9XvYSUCapHnxGSyedeU.onAnimationEnd(lambda)
       at flussonic.watcher.sdk.presentation.timeline.animation.AnimationListener.onAnimationEnd(AnimationListener.java:27)
       at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1239)
       at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:766)
       at android.animation.ValueAnimator$AnimationHandler$1.run(ValueAnimator.java:801)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
       at android.view.Choreographer.doCallbacks(Choreographer.java:670)
       at android.view.Choreographer.doFrame(Choreographer.java:603)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5417)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)