Exporting Org Mode buffers to LaTeX buffer fails with wrong-type-argument

[hperrey]

I confirm that...

• I searched the FAQ, issue tracker, discussions board, documentation, and wiki, and found nothing about my issue.

• I read the debugging guide and researched the issue to the best of my ability.

• My issue can be observed on the latest available commit of Doom.

• My issue can be observed on a stable release of Emacs (i.e. doesn't end in .50, .60, or .9*)

Describe your issue

When exporting an Org Mode buffer to LaTeX (non-evil: C-c C-e l L) this will fail with the following error:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  expand-file-name(nil)
  reftex-TeX-master-file()
  reftex-tie-multifile-symbols()
  reftex-add-to-label-alist((AMSTeX))
  #f(compiled-function () #<bytecode 0x1520e3e7e39c8316>)()
  #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_105>([TeX-style-hook #f(compiled-function () #<bytecode 0x1520e3e7e39c8316>) 1])
  mapcar(#<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_105> ([TeX-style-hook #f(compiled-function () #<bytecode 0x1520e3e7e39c8316>) 1]))
  #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_106>("amsmath")
  TeX-run-style-hooks("latex2e" "article" "art10" "inputenc" "fontenc" "graphicx" "longtable" "wrapfig" "rotating" "ulem" "amsmath" "amssymb" "capt-of" "hyperref" "svg" "tikz" "booktabs" "siunitx" "color" "listings")
  TeX-auto-apply-entry((styles TeX-auto-file TeX-run-style-hooks))
  TeX-auto-apply()
  TeX-update-style()
  TeX-mode-cleanup()
  #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_126>()
  run-mode-hooks(LaTeX-mode-hook)
  LaTeX-mode()
  org-export-to-buffer(latex "*Org LATEX Export*" nil nil nil nil nil LaTeX-mode)
  org-latex-export-as-latex(nil nil nil nil)
  org-export-dispatch(nil)
  funcall-interactively(org-export-dispatch nil)
  command-execute(org-export-dispatch)

On the other hand, exporting e.g. to file (l l) works fine! I see this in the sandbox (minus my config) too. Vanilla doom, however, produces the expected LaTeX buffer.

It looks a little like this issue: doomemacs/doomemacs#8096
But that is only because the error is triggered in the same function, so I am not sure how helpful that connection is.

Steps to reproduce

I believe this should be sufficient to reproduce the issue:

1. Open Doom Emacs with latex and org enabled.
2. Create a new Org Mode file with any content.
3. Call Org Export (C-c C-e) and select LaTeX Buffer (l L)

System information

https://pastebin.com/Sr55kSvt

[RaghuNaik]

Yes I have also experienced the same behavior. Though, the org export buffer is still available with SPC b i