The following consistently crashes my R session.
Tested on two machines, Ubuntu and Mac OS X with similar results on both.

Brief Description:
Calling write.table on a data.frame with factor column of all NA's.

The original data set is rather large, and I've managed to isolate the offending column and then create a similar vector, named PROBLEM_DATA below, which causes the same crash.

Interestingly, sometimes R crashes outright, othertimes it simply throws the following error: 

Error in write.table(x, file, nrow(x), p, rnames, sep, eol, na, dec, as.integer(quote),  : 
  'getCharCE' must be called on a CHARSXP

Any thoughts as to the cause of the crash or should it be submitted as a bug?

Offending data and call: 

PROBLEM_DATA <- structure(114:116, .Label = c("String1", "String2", "String3", "String4", "String5", "String6", 
                   "String7", "String8", "String9", "String10", "String11", "String12", "String13", "String14", "String15"), class = "factor")

# This will cause a crash
write.table(PROBLEM_DATA, file=path.expand("~/test.csv"))

# This will also crash
write.table(PROBLEM_DATA, file=path.expand("~/test.csv"), fileEncoding="UTF-8")

SESSION INFO OF EACH MACHINE

UBUNTU

R version 2.15.3 (2013-03-01)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C         LC_TIME=C            LC_COLLATE=C        
 [5] LC_MONETARY=C        LC_MESSAGES=C        LC_PAPER=C           LC_NAME=C           
 [9] LC_ADDRESS=C         LC_TELEPHONE=C       LC_MEASUREMENT=C     LC_IDENTIFICATION=C 

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] gdata_2.12.0     ggplot2_0.9.3    stringr_0.6.1    RMySQL_0.9-3     DBI_0.2-5       
[6] data.table_1.8.8

loaded via a namespace (and not
r crash write.table
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