hey there, 

your Plugin is causing a critical error on a site. at the moment its deactivated so its hard to show you. 

when i activate it, its leads to a critical error. The error log says: 

2022/01/21 16:35:55 [error] 32418#32418: *33712 open() "/home/wp/disk/wordpress/.well-known/assetlinks.json" failed (2: No such file or directory), client: 188.136.227.203, server: mitglieder.balancer-gesundheitsportal.de, request: "GET /.well-known/assetlinks.json HTTP/1.1", host: "mitglieder.balancer-gesundheitsportal.de"
#7 /home/wp/disk/wordpress/wp-content/plugins/mp3-music-player-by-sonaar/includes/cl" while reading response header from upstream, client: 93.238.86.68, server: mitglieder.balancer-gesundheitsportal.de, request: "GET /?memb_autologin=yes&auth_key=SCyKWEEaRLdj&Id=71356&Email=annette.wensker%40gmail.com&redir=/onlinekurse/%3FClubname%3Dzott HTTP/2.0", upstream: "fastcgi://unix:/var/run/wordpress.php-fpm.sock:", host: "mitglieder.balancer-gesundheitsportal.de", referrer: "https://mitglieder.balancer-gesundheitsportal.de/vg/?memb_autologin=yes&virtuagym-member-id=35120752&club-id=57642&external-id=71356&member-email=annette.wensker%40gmail.com&sig=665d9fa29ae7bf954c6112c4bb2cb0bab3615c41f255551edb09a00b25a20d9a&returl=%25onlinekurse%25%3FClubname%3Dzott"
#6 /home/wp/disk/wordpress/wp-content/plugins/mp3-music-player-by-sonaar/admin/class-sonaar-music-admin.php(3095): WP_Query->__construct(Array)

Any idea or workaround?

thanks a lot. 

BR 

tom