Why is the result "canceled" when scanning a qr code with a cordova scanner?

Question

Apache Cordova

$cordovaBarcodeScanner
        .scan({
          formats : 'QR_CODE'
        })
        .then(onSuccess, onError);

function onSuccess(qr)  {
...
}

if it was not possible to scan, the attempt to scan is repeated, but qr.canceled = true comes to onSuccess.
onError is never called at all

Answer 1

helped

function scan() {
        $timeout(function() {
             $cordovaBarcodeScanner.scan().then(onSuccess, onError);
        });
    }

Answer 2

Plugin bug! change or write to the developer.