Blank in easy chart after upgrading from 7.xx to 8.1.15

Ignition
,
1

Hi All,

I have a problem with charts after upgrading to 8.1.15, i have blanks in easy chart (cf screenshot).

image
image795×504 69.7 KB

However, i have datas stored in the database (cf export from the chart)

Chart.xlsx (14.7 KB)

Any help ?
Thanks