Warning: Illegal string offset – new info

Hi, you can change problematic lines, like this:

$this->lyricsOnly = isset($cnl_options['lyrics-only']);

The same approach can be applied and in this code:

if(isset($cnl_options['lyrics-only'])){
		$checked = ' checked="checked" ';
	}
	echo '<input '.$checked.' name="'.$user_settings_name.'[lyrics-only]" type="checkbox" />Lyrics Only';
}

https://wordpress.org/plugins/chords-and-lyrics/