creating a heatmap where the data has NaN values in it

I am trying to create a heatmap using the heatmap.2 package. My data has lot's of NaN values in it, and what I would like to do is the following. Every time there is a NaN value, simply have the cell be colored as light grey (or some other neutral color, maybe white), and all of the other values (which are log2 expression) to have a standard green/yellow/red coloring scheme. Here is my code that I have ben using:

heatmap.2(as.matrix(foo2[rowSums (abs(foo2)) != 0,]),          col = redgreen,          margins = c(12, 22),          trace = "none",           xlab = "Comparison",          lhei = c(2, 8),          scale = c("none"),          symbreaks = min(foo2 = 0, na.rm = TRUE),          na.color = "blue",          cexRow = 0.5,          cexCol = .7,          main = "DE geness",          Colv = F)

This works well when there is no NaN values, but when the data has NaN, I am getting an error which says:

Error in hclustfun(distfun(x)) :   NA/NaN/Inf in foreign function call (arg 11)

Essentially, I would like to have it ignore the NaN's in the data. I am not sure how to handle this. any help would be greatly appreciated.