Invalid LatLng object when using dx and dy in ASCII grid

[zacharyburnett]

When using an ASCII grid with different cell lengths in the x and y directions, I get this error:

Uncaught Error: Invalid LatLng object: (NaN, NaN)
    at new M (leaflet.js:5)
    at Object.C [as latLng] (leaflet.js:5)
    at e.value (Field.js:73)
    at e.value (VectorField.js:176)
    at new e (VectorField.js:83)
    at Function.value (VectorField.js:21)
    at leaflet_panes.js:111
    at d3.v4.min.js:2
    at Object.<anonymous> (d3.v4.min.js:2)
    at k.call (d3.v4.min.js:2)

[VictorVelarde]

Library should allow different sizes in both dimensions, so the error could be in another part (coordinate system?). An online page showing this error could be helpful to diagnose the problem.