Strange error in StackedColumnRenderableSeries

Hello,

I have a SciChartSurface with multiple StackedColumnRenderableSeries. The goal is to create a column style “Stacked Graph”.

The StackedColumnRenderableSeries are created this way:

private StackedColumnRenderableSeries[] m_layers = new StackedColumnRenderableSeries[0];
  -------
    while (num  > m_layers.Length)
              {                
                  StackedColumnRenderableSeries layer = new StackedColumnRenderableSeries()
                  {
                      DataPointWidth = 0.9,                  
                      Fill = new SolidColorBrush(DefaultMainColorOfCurrentSetting),
                      Stroke = Colors.Black,
                      ShowLabel = false  
                  };
  
                      layer.DataSeries = new XyDataSeries<double, double>();
                      layer.DataSeries.AcceptsUnsortedData = true;
  
                  m_sciChartSurface.RenderableSeries.Add(layer);
                 
                  List<StackedColumnRenderableSeries> temp = m_layers.ToList();
                  temp.Add(layer);
                  m_layers = temp.ToArray();
                 
              }
  

Later, they are fed data with this function:

void addBar(double[] layerValues)
          {
  
              using (m_sciChartSurface.SuspendUpdates())
              {   
                  for (int i = 0; i < m_layers.Length; i++)
                  {
                      XyDataSeries<double, double> data = (XyDataSeries<double, double>)m_layers[i].DataSeries;   
                      data.Append(m_currentTimepoint, layerValues[i]);
                  }
              }
  
              m_currentTimepoint++;
          }
  
  private int m_currentTimepoint = 1;
  

If I use this function within the class constructor, everything works as expected (see attached image).

However, sometimes, I receive the error message “”System.ArgumentException” in SciChart.Charting.dll The StackedColumnRenderableSeries type requires that all stacked stacked series with the same StackedGroupId have the same XValues.”

I fail to see the meaning of this message, since, the x-Value is the same for each part of the new column. Its “m_currentTimepoint”.

Additional Information:

This visualization is part of a medical monitoring software we are currently developing. If we use test data to call the addBar-Function (directly from the constructor, for example), the error does not appear. However, if we use data from our medical sensors, it appears. In both cases, the addBar-Function receives valid data (no NaN´s or such things)

The function is not called often, about once every 10 seconds.

Thank you