utils::news does not work in RStudio

When running RStudio (Version 1.2.1335) on Linux Ubuntu 18.04.3 LTS,

I get an error with the command:

utils::news("dplyr")
# Error in UseMethod("toHTML") : no applicable method for 'toHTML' applied to an object of class "NULL"

This works fine with R from the command line:

utils::news("dplyr")
# starting httpd help server ... done

I'm using R Version:

R.version$version.string
# [1] "R version 3.6.1 Patched (2019-10-04 r77258)"

Best,
Marcel