fetch the last values if they don't exist in the month

[151562]

As you can see in the example, the month of October has no value, so it doesn't appear in the table.

What I want is for the month of october to have the value of the month of september.

In other words, I want all the months of the year and when they don't exist they get the previous value
How can I do this?
thank you in advance.

Update: 

I created a calendar to have the months null and I tried to use the above function but it only fetches the last value from the table.
I also tried using the peek function but it's not working
My condition in the script is as follows:
if(IsNull(Value) or Value=0,peek(Value),Value)
In the table I am aggregating by month when I use above:
sum(aggr(if(IsNull(sum(Value)) or sum(Value)=0,above(sum(Value)),sum(Value)),Mes))