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\RequirePackage{scrlfile}
\makeatletter
\AfterPackage{scrkbase}{%
  \renewcommand*{\FamilyExecuteOptions}[3][.\@currname.\@currext]{%
    \def\reserved@a##1\@nil{%
      \@for\scr@key@atlist:=#3\do{%
        \expandafter\scr@key@split@name@value\scr@key@atlist==\@nil
        \scr@ifundefinedorrelax{KV@#2@\scr@key@name}{}{%
          \edef\reserved@a{\noexpand\setkeys{#2}{\scr@key@atlist}%
          }%
          \reserved@a
        }%
        \scr@ifundefinedorrelax{KV@#2#1@\scr@key@name}{}{%
          \edef\reserved@a{%
            \noexpand\setkeys{#2#1}{\scr@key@atlist}%
          }%
          % Wenn hier \scr@key@atlist nicht gesichert wird, kann die
          % Option footnosepline nicht ohne Fehler benutzt werden
          \let\TEMPXYZ\scr@key@atlist
          \reserved@a
          \let\scr@key@atlist\TEMPXYZ
        }%
        \let\CurrentOption\scr@key@atlist
        \csname ds@\CurrentOption\endcsname
      }%
      \edef\CurrentOption{##1}%
    }%
    \expandafter\reserved@a\CurrentOption\@nil
  }%
}
\makeatother
\documentclass[ 
footnosepline,
]{scrbook}
\listfiles 
\begin{document} 
text 
\end{document} 

\documentclass[
footnosepline,
]{scrbook}
\listfiles
\begin{document}
text
\end{document}

! Undefined control sequence.
\CurrentOption ->\@nil
                       
l.1000 \KOMAProcessOptions
                          \relax
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.