Error and not visible

Hello,

On Firefox the widget displays fine but on Safari and ?other browser? it is not. In webmaster tools in FireFox I see error:

ErrorUtils caught an error:

Cannot listen to an undefined element. [Caught in: Tried to listen to element of type click]

Subsequent non-fatal errors won't be logged; see https://fburl.com/debugjs.

errorListener https://static.xx.fbcdn.net/rsrc.php/v3/yR/r/9eTss4wyX8S.js?_nc_x=Ij3Wp8lg5Kz:61
    reportNormalizedError https://static.xx.fbcdn.net/rsrc.php/v3/yR/r/9eTss4wyX8S.js?_nc_x=Ij3Wp8lg5Kz:61
    $1 https://static.xx.fbcdn.net/rsrc.php/v3/yR/r/9eTss4wyX8S.js?_nc_x=Ij3Wp8lg5Kz:61
    mustfix https://static.xx.fbcdn.net/rsrc.php/v3/yR/r/9eTss4wyX8S.js?_nc_x=Ij3Wp8lg5Kz:61
    listen https://static.xx.fbcdn.net/rsrc.php/v3/yR/r/9eTss4wyX8S.js?_nc_x=Ij3Wp8lg5Kz:289
    l https://static.xx.fbcdn.net/rsrc.php/v3/yz/r/7mVAm5TtRCZ.js?_nc_x=Ij3Wp8lg5Kz:11
    initializeClickLoggers https://static.xx.fbcdn.net/rsrc.php/v3/yz/r/7mVAm5TtRCZ.js?_nc_x=Ij3Wp8lg5Kz:11

And this is a long list..... 

WordPress is latest version 6.3.2….

Thank you for your help.
Regards, Vincent Volmer

The customer asked me to remove the widget temporally, but I can enable it again for you so you can debug and see the error!