r - RStudio crashes when invoke file.choose() -

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errors occur randomly when trying execute:

myfile <- file.choose() mydata  <- read.csv(myfile, header=false, sep=",")

however

mydata <- read.csv(file.choose(), header=false, sep=",")

works stable. what's wrong first implementation?

sessioninfo():

r version 3.2.0 (2015-04-16) platform: x86_64-w64-mingw32/x64 (64-bit) running under: windows 8 x64 (build 9200)  locale: [1] lc_collate=english_new zealand.1252  lc_ctype=english_new zealand.1252    [3] lc_monetary=english_new zealand.1252 lc_numeric=c                         [5] lc_time=english_new zealand.1252      attached base packages: [1] stats     graphics  grdevices utils     datasets  methods   base       loaded via namespace (and not attached): [1] tools_3.2.0


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