Error at qplot step for plotting distribution

[Maria Ahmed]

I'm new to Monocle, and going through the steps mentioned here. I created my CDS from a Seurat object.

To verify that the expression values stored in CellDataSet follow a distribution that is roughly lognormal, I ran the following code:

qplot(value, geom = "density", data = melted_dens_df) +

  stat_function(fun = dnorm, size = 0.5, color = 'red') +

  xlab("Standardized log(FPKM)") +

  ylab("Density")

It gave an error:

Warning messages:

1: Removed 42430640 rows containing non-finite values (stat_density). 

2: Computation failed in `stat_function()`:

'from' must be a finite number 

Can anyone help me understand what the fix is for this? Thank you so much!