When I try to plot only 1 point, the following error message appears:
Error in if (sdx == 0) sdx <- 1 : missing value where TRUE/FALSE needed

The issue relies in the wordlayout functions, when computing the standard deviation:
sdx <- sd(x, na.rm = TRUE)
sdy <- sd(y, na.rm = TRUE)
If x and y refer to only 1 point, sdx and sdy result in NA and this causes the above error message.

Steps to reproduce the issue:
library(wordcloud)
df = data.frame(id = 'sample', x = 0.2, y = 0.4)
plot(x = df$x, y = df$y)
textplot(x = df$x, y = df$y, words = df$id, new = F)

Informations about system:
OS: Debian 9.3 - linux-image-4.9.0-5-amd64
R version 3.4.3 (CRAN Repository)

It doesn't seem like this is the place to contribute updates to the wordcloud package. Is there a way for anyone to contribute to the package?

The only thing I've found so far is confusing behavior in the wordcloud function when min.freq is greater that max(freq). In that case, it shows all words, but doesn't tell you that your minimum frequency is greater than the max frequency, and it's showing all words.