Shopping performance Report with empty (' --' ) offerId

Hi,

I have made on application for downloading daily performance of our shopping campaign, but sometimes I get in the downloaded report a line like this one:

0, --, --,0,0.0,0.00%,0.0,0,0,0.00%,2016-09-12,4, --,2016-09-12

With the following fields:

     AverageCpc,
      Brand,
      Channel,
      Clicks,
      Conversions,
      ConversionRate,
      ConversionValue,
      Cost,
      CostPerConversion,
      Ctr,
      Date,
      Impressions,
      OfferId,
      Week


Is there any particular reasons why there is an 'empty' brand  channel and offerId ?

Thanks

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