getting [{"id":"","name":"null","_stream":null}] for some android phone in a cordova app

[priyambadaBestinet]

Hi ,
i am using Instascan an HTML5 QR scanner in my cordova app to scan QR codes , but for some android models i am getting [{"id":"","name":"null","_stream":null}] for Instascan.Camera.getCameras().then(function (cameras) {
alert(JSON.stringify(cameras));
}).catch(function (e) {
alert(e)
//console.error(e);
});