Uncaught TypeError: Cannot read property

Hi All

chrome devtools report this error:

Uncaught TypeError: Cannot read property ‘indexOf’ of null
at Object.c.customError (wp-mediaelement.min.js:1)
at e.value (mediaelement-and-player.min.js:12)
at Object.error (mediaelement-and-player.min.js:12)
at new e (mediaelement-and-player.min.js:12)
at e.value (mediaelement-and-player.min.js:12)
at e.MediaElementPlayer.init (mediaelement-migrate.min.js:1)
at new e (mediaelement-and-player.min.js:12)
at HTMLAudioElement.<anonymous> (mediaelement-and-player.min.js:12)
at Function.each (jquery.js:2)
at a.fn.init.each (jquery.js:2)

someone can help me ?
the wordpress installation is new and clean
no plugins installed
thanks for any help :(