java - Mapbox Android SDK Null Pointer exception on screen orintation change and crash on API 25 -


i getting null pointer exception when screen orientation changes vertical horizontal (all other api's) , upon launch on api25 .

here stack trace , code in question. 

 09-11 20:24:57.386 2794-2794/com.example.andrew.satwatch e/androidruntime: fatal exception: main process: com.example.andrew.satwatch, pid: 2794 java.lang.nullpointerexception: attempt invoke virtual method 'void com.mapbox.mapboxsdk.maps.mapboxmap.addsource(com.mapbox.mapboxsdk.style.sources.source)' on null object reference                                                                            @ com.example.andrew.satwatch.mainactivity.addvectorlayersource(mainactivity.java:1018)                                                                            @ com.example.andrew.satwatch.mainactivity.addcountries(mainactivity.java:988)                                                                            @ com.example.andrew.satwatch.mainactivity.onitemselected(mainactivity.java:423)

code in question

public linelayer addvectorlayersource(string url, string sourcekey, string sourceid){       mytileset = new tileset(sourceid+"_tileset", url);      map.addsource(new vectorsource(sourceid+"_data", mytileset));      linelayer linedata = new linelayer(sourceid+"-data", sourceid+"_data");     linedata.setsourcelayer(sourcekey);   //  map.addlayer(linedata);       return linedata;  }           public void addcountries(){      linelayer layer = addvectorlayersource("https://storage.googleapis.com/satsquatch-overlays-test/states_countries/{z}/{x}/{y}.pbf","mergedgeojson","country");      layer.setproperties(             linejoin(property.line_join_round),             linecap(property.line_cap_round),             linecolor(color.parsecolor("#2f82b7")),             linewidth(1.25f)     );     layer.setmaxzoom(10);     layer.setminzoom(0);      map.addlayer(layer);     }


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