Chart shows the header as a item in chart calculation

[MuffiZainu]

In UX > View type: Chart > Histogram

I have a column which has a header named "Account".

The histogram calculates correctly, however, it shows the header name "Account" as one of the items in the x-axis of the chart. It shows as Zero (because there's no calculation to it). 

How do I remove it from the chart, because it's taking unnecessary space.

(Images attached)

Thanks