Bug: duplicated \texttt in LaTeX export

[Maxim Nikulin]

It seems, something goes wrong with LaTeX export at least in git master

---- >8 ----
#+PROPERTY: header-args :eval never-export :exports code :results silent

src_elisp{(delete-dups nil)}
---- 8< ----

Export as LaTeX buffer:

    \texttt{\texttt{(delete-dups nil)}}

I see no reason why \texttt should be doubled this case. Expectation: e.g.

    \texttt{(delete-dups nil)}