Error from .lintr.R configuration when invoked via R Studio addin (but not console)

[HaHeho]

I'm filing a separate bug report as requested in #1210 (comment).

The following issue arises when using the new .lintr.R syntax in R Studio, as first described in #1210 (comment).

Executing lintr::lint("file") in the console works fine, but executing the adding via a keyboard shortcut causes the following error.

> lintr:::addin_lint()
Error in read.dcf(config_file, all = TRUE) : Invalid DCF format.
Regular lines must have a tag.
Offending lines start with:
  linters <- linters_with_defaults(
  )

The .lintr.R file is an almost empty:

linters <- linters_with_defaults(
  object_name_linter = NULL
)