R warning: "Package: statistics" may not be available at boot "

I've been working with bundle arules

and bundle RODBC

for a few days at RStudio. In the meantime, I saved the artboard image several times. But today I wanted to save the stage image again and now I am getting this warning:

Warning message: In save (list = ls (envir = .GlobalEnv, all.names = TRUE), file = outfile ,: 'package: stats' may not be available at boot

I only used arules

both RODBC

functions and str_split_fixed

from stringr

and some standard things like data.frame

.
I haven't even used the package stats

. If you reload the Stage image, it does not affect it. But the warning bothers me anyway, especially since it stats

should be a standard R package, how it might not be available ... How can I resolve this warning?