Error in linbin2D: (list) object cannot be coerced to type 'double'

When calling bkde2D you might encounter the following error:

Error in linbin2D(x, gpoints1, gpoints2) : 
  (list) object cannot be coerced to type 'double'

This issue can manifest itself when the passed in data is a tibble instead of a data.frame.

Easy fix:

data <- as.data.frame(data)