Why does resharper think this is wrong?

gistfile1.txt

catch (WebException e)
{
    if(e.Response != null)
    {
        //resharper claims next line "Possible null assignment to entity  
        //marked with NotNull attribute.
        //makes no sense to me because i'm checking null first

        var r = new StreamReader(e.Response.GetResponseStream());
        var data = r.ReadToEnd();
        r.Close();
        Logger.LogWarningMessage(string.Format("Trade failed to be updated \n Reason: {0}", data));
    }
}