java.lang.NullPointerException: Attempt to write to field 'int android.view.ViewGroup$LayoutParams.height' on a null object reference

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Attempt to write to field 'int android.view.ViewGroup$LayoutParams.height' on a null object reference
java.lang.NullPointerException: Attempt to write to field 'int android.view.ViewGroup$LayoutParams.height' on a null object reference
at afinal.projeto.unb.guiadoaluno.Mapa$1$1.getInfoWindow(Mapa.java:87)
at com.mapbox.mapboxsdk.annotations.Marker.showInfoWindow(Marker.java:165)
at com.mapbox.mapboxsdk.maps.MapboxMap.selectMarker(MapboxMap.java:1295)
at com.mapbox.mapboxsdk.maps.MapView$GestureListener.onSingleTapConfirmed(MapView.java:1792)
at android.view.GestureDetector$GestureHandler.handleMessage(GestureDetector.java:280)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5940)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184)

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