I believe result of the filter is False for those specific months where you are seeing line breaks. Because data for False results is being excluded from the graph therefore you are seeing a gap.
thanks for answer)
how to create right filter for this case?)
Are you looking for a line chart which shows only those salers whose sales were >=100 for all months within given time frame?
Try If sum([Sales]) >= 1000 then 'True' else 'False' END
If not works then share your workbook