Invalid UTF-8 byte sequence (<c4>\group_end:) when recalling chords

[schrjako]

When I use the ^ shortcut for recalling chords in a verse-environment I get the error

! LaTeX Error: Invalid UTF-8 byte sequence (<c4>\group_end:).

I created a minimal example with which I get this error:

\documentclass{article}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[slovene]{babel}

\usepackage{leadsheets}

\setleadsheets{empty-chord-dim=0pt,smash-chords=true}

\begin{document}
	\begin{song}[remember-chords=true]{title={Example title}}

		\begin{verse}
			bol^Gj je
		\end{verse}

		\begin{verse}
			ni^č ne
		\end{verse}

	\end{song}
\end{document}

I found a workaround to this problem (using ^* {}č instead of ^č), but I don't believe this is the intended way to write this.

I'm attaching a log file of trying to generate a pdf (the command I ran is latex -output-format=pdf minimalexample.tex):
minimalexample.log

Is there any way to fix this?