Visible MajorTickMarks in char line ssrs.

See more:

SSRS

Hi bro !!!
I have a data :
Name Month Total
A NULL NULL
In chart line i set Category Group is Month. Series group is Name
When i run chart. Series is A . But in X-axis doesn't have Month. I know because it is null.
But it still displays MajorTickMarks.
How can i hide it.
I have tried to use setting Chart Axis -> MajorTickMarks -> Enabled -> Expression
=Iif(Isnothing(Month),false,true)

But it is not working.
How can i fix it ???