Unsorted data adding to the X-Direction

Hello,
I have real-time chart with sorted X axis. It is OK for me because data which displayed on chart comes from industrial equipment with “always incremented” X value. But sometimes process stop. In this case industrial equipment received values near last before stop (differed by 5th or 6th decimal sing). And in this case I don’t need to build chart. I will want check new X values for they next value must be more than previous, because now I have error “Data has been Appended to a DataSeries which is unsorted in the X-Direction. Unsorted data can have severe performance implications in SciChart”.
For Y values DataSeries has DataSeries.LatestYValue and I can compare it to new value. What the best way to avoid adding ‘less than last’ value for X axis.