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uploadTask进度前台显示报错？

大神们帮我看看 这是咋回事呢

postImages: function () {
  
    var that = this
    var quantity = 9
  
    query.chooseImages(quantity, function(imageRes){
        
      var filePaths = imageRes.tempFilePaths 
  
      for (var i = 0; i < filePaths.length; i++) {
  
        var filePath = filePaths[i]
  
        var imagesPreviewTemp = {'filePath':filePath,'fileID':'','progress':0}
 
        that.data.imagesPreview.push(imagesPreviewTemp)
 
        that.setData({
 
          imagesPreview:that.data.imagesPreview
 
        })
  
        var fileName = common.getUniqueFileName(app.globalData.userInfo._id)
 
        var cloudPath = fileName + filePath.match(/\.[^.]+?$/)[0]
         
       query.uploadImages(cloudPath, filePath, function(res) {
 
       //uploadFile成功后回调
 
          var fileID = res.fileID
 
          that.data.imagesPreview[i].fileID = fileID
            
          that.setData({
 
            imagesPreview: that.data.imagesPreview
 
          })
            
        }, function(res) {
 
        //uploadTask.onProgressUpdate成功后回调
            
           that.data.imagesPreview[i].progress = res.progress
        // 一直在这里报错，说that.data.imagesPreview[i].progress is not defined.
  
           that.setData({
 
             imagesPreview: that.data.imagesPreview
 
           })
          console.log('上传进度', res.progress)
          // console.log('已经上传的数据长度', res.totalBytesSent)
          // console.log('预期需要上传的数据总长度', res.totalBytesExpectedToSend)
        })
      }
      // wx.hideLoading()
  
    })
  },


一直报错说that.data.imagesPreview[i].progress is not defined. 但是初始值已经有了个progress:0了，为什么会报错呢？

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监控进度云开发uploadTask