Using tikzpictures as symbols in glossaries

In a text, I'm using a tikzpicture as a math symbol. I'd like to reference this symbol in a glossary. It seems to me that makeindex doesn't know how to draw the picture. Here's an example.

\documentclass[12pt]{scrbook}

\usepackage{a4wide}
\usepackage{tikz}
\usepackage[toc, section, numberline]{glossaries}

\newcommand{\Plus}{\mathord{
\begin{tikzpicture}[baseline=0ex, line width=1, scale=0.13]
\draw (1,0) -- (1,2);
\draw (0,1) -- (2,1);
\end{tikzpicture}}}

\makeglossaries

\newglossaryentry{gls:Plus}{name={\ensuremath{\Plus}},description=\nopostdesc} % Does not work; change \Plus to, e.g., + else to compile.

\begin{document}
$A \gls{gls:Plus} B$

$A \Plus B$
\printglossary[type=main, style=list, nonumberlist=false]
\end{document}
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Here's the log I get when I try to compile, regardless of \protect, or not: pastebin.com/iJjw9GVQ –  Roland Jan 16 '13 at 11:41