Compose.line called with wrong object type in render
Compose.line called with wrong object type in render

In case

elseif length(aes.color) == 1 &&
            !(isa(aes.color, PooledDataArray) && length(levels(aes.color)) > 1)

the Compose.line is called with the wrong type (it expects array of array of tuple; compare else branch).
dcjones/Gadfly.jl