I think this will happen when we are having NULL vales in our data , you can filter NULL values , when you implement Line chart it will show you NULL indicator , there you can filter out NULL values from chart.
So here it is not possible.
It is possible to do that.
Please Upload the workbook. So that we will be able to help you out.
Done the same Mahfooj.
But the chart is not displaying any data.Complete Blank.
Can you share your workbook? It will be helpful for us to analyse the issue.