esttab LaTex export problem

[Mor Zahavi]

Hi everyone, I have encountered a problem and could not find a resource which discusses it. I am exporting xtreg results to LaTex using esttab. Here is a minimal example to demonstrate the issue: I run a regression -

quietly: eststo: xtreg z_math loc_tib, i(cntid)

and export:

 esttab using `reg1'.tex, replace nolines tex

So far so good. However, if I add prehead(\hline) inside esttab:

esttab using `reg1'.tex, replace nolines prehead(\hline) tex

the export omits the command

\begin{tabular}

from the LaTex file, whereas if I add

posthead(\hline)

, the export is correct.