var datastring;
function LoadDataPLayer(){
    FBInstant.player
  .getDataAsync(['dataPl'])
  .then(function(data) {
     console.log('data is loaded');
     console.log('DATA FB: '+data['dataPl'] );
     if(data!== undefined){
        dataString = data['dataPl'];
     }
     else{
        dataString = '';
     }
     
     console.log('dtstring: '+ dataString);
  });
}

the console always give me some random int. For example: DATA FB: 52884176 so how can i check when the key[dataPl] is undefined. if(data[dataPl] !== undefined) is not working . i use fb instant game api 7.0. any comments help me a lot !!!