\begin{longtable}{c}
\begin{longtable}{c}aaa\begin{longtable}{c}bbb\end{longtable}\end{longtable}\tabularnewline

% success
\begin{longtable}{c}
aaa\begin{longtable}{c}bbb\end{longtable}\end{longtable}\tabularnewline

% fail
\multirow{2}{0.11\paperwidth}{\begin{longtable}{c}aaa\begin{longtable}{c}bbb\end{longtable}\end{longtable}\tabularnewline
\end{longtable}
Немного русского текста в конце документа