factoextra: Error in if (xlab == "x") xlab <- "x value" : argument is of length zero
I actually found an answer just accidentally. It is very unfortunate that factoextra documentation does not explicitly say that data parameter should be of data.frame type. In my case rtsne$Y was a matrix. The error that factoextra is giving is very uninformative.

Here is the code that ultimately worked:

fviz_cluster(db, 
-----&gt;  data = as.data.frame(rtsne$Y), 
        stand = FALSE,
        ellipse = FALSE, show.clust.cent = FALSE,
        geom = "point",palette = "jco", ggtheme = theme_classic())