No result displayed when visualizing simple boolean percentage

Hello,

From the dashboard i select the field i'm interested in and i click on visualize, just to have a representation of True/False of my field, and test my data.

But i get no results. Here are some pictures to illustrate what's the problem i'm facing:


The Y-Axis in your screenshot is based on the Unique count of societe. But I do not see the "societe" field in the second screenshot. Are you sure there is data in the societe field?