Uncaught Error: Call to undefined function wp_read_audio_metadata

Hello,

When I upload an audio file (mp3) to the media library, I get this error (when Robin Image Optimizer is enabled):

Fatal error: Uncaught Error: Call to undefined function wp_read_audio_metadata() in wp-admin/includes/image.php:489

in wp_generate_attachment_metadata called at wp-content/plugins/robin-image-optimizer/includes/classes/class-rio-attachment.php (145)
in WIO_Attachment::regenerate_metadata called at wp-content/plugins/robin-image-optimizer/includes/classes/class-rio-attachment.php (264)
in WIO_Attachment::optimize called at wp-content/plugins/robin-image-optimizer/includes/classes/class-rio-media-library.php (144)
in WRIO_Media_Library::optimizeAttachment called at wp-content/plugins/robin-image-optimizer/includes/classes/class-rio-cron.php (108)
in WRIO_Cron::optimization_process called at wp-includes/class-wp-hook.php (292)
in WP_Hook::apply_filters called at wp-includes/class-wp-hook.php (316)
in WP_Hook::do_action called at wp-includes/plugin.php (551)
in do_action_ref_array called at wp-cron.php (138)

It looks like RIO is trying to optimize the file even though it’s not an image … quite strange… Any suggestions? Thanks!