How to supress Missing character: There is no ; (U+003B) in font nullfont!

I am running LuaLaTeX locally on my computer. In my IDE, errors and warning messages are very pronounced.

Specifically, the Missing character: There is no ; (U+003B) in font nullfont! error is raising a lot of false alarms - despite being harmless.(https://tex.stackexchange.com/a/708053/319072)

I tried the solution here to "see" where the problem occurs: https://tex.stackexchange.com/a/147736/319072

The solution causes normal hf-tikz syntax to no longer work (which I know is expected - it is a troubleshooting method).

\documentclass{article}
\usepackage{hf-tikz}
\font\nullfont=cmr10
\begin{document}
\[
\begin{array}{ccc}
    \tikzmarkin{a}a&b&c\tikzmarkend{a}
\end{array}
\]
\end{document}

How can I suppress this exact error, so my editor only warns me about substantial (non-harmless) errors?