# highlight (soul package) in figure caption generates error

I have a short command that allows me to highlight some text for internal review purposes. Unfortunately, when I use it in a Caption of a figure it gives me the following error.

Argument of \@textcolor has an extra }. ...MA{This is my comment} More caption text.}
Paragraph ended before \@textcolor was complete. ...MA{This is my comment} More caption text.}


Here is my MWE that generates that error:

\documentclass{article}

\usepackage{graphicx}           % For figures and stuff
\usepackage{xcolor}             % Colors
\usepackage{soul}               % Highlight with \hl

%Colored comments for internal review purposes
\newcommand{\MA}[1]{{\sethlcolor{lime}\hl{#1}}}

\begin{document}

Highlighting \MA{in the text} works fine.

\begin{figure}[htbp!]
\centering
\includegraphics[width=3cm]{example-image}
\caption{This is a picture. \MA{This is my comment} More caption text.}
\label{fig:Examplefigure}
\end{figure}

\end{document}


Macro \MA is not robust for moving arguments like figure captions.
• Use \protect:
\protect\MA{...}

\newcommand{\MA}{}% Error, if \MA is already defined.