How to increment CartesianIndex?

New to Julia
4

That is extremely close to what I want. I notice that it does not error out though:

julia> A = zeros(5,5)
5×5 Matrix{Float64}:
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0

julia> nextind(A, CartesianIndex(4,1))
CartesianIndex(5, 1)

julia> nextind(A, CartesianIndex(4,1))
CartesianIndex(5, 1)

julia> nextind(A, CartesianIndex(5,5))
CartesianIndex(1, 6)

julia> nextind(A, CartesianIndex(5,6))
CartesianIndex(1, 7)

julia> nextind(A, CartesianIndex(5,7))
CartesianIndex(1, 8)

I would like it to throw nothing or return the same value when doing 5,5 since it is last element.

Kind regards