Steps to reproduce the issue

Backend: go to content -> media, create new directory >test.png< (which makes no sense, but a customer of me did and caused the error)

Expected result

• show message "can't create directory"
• directory was not created
• com_media keeps working

Actual result

• message is shown
• directory was created
• com_media shows no content any more; on some systems message "image not found" appears, but not for all systems (dont know why the behaviour is different for same release number systems)

System information (as much as possible)

Joomla 4.1.2 (current stable)
PHP 7.4

Additional comments

maybe a solution could be to check if current string is a directory or file; currently com_media treats directorys as file if name syntax matches to file name syntax and tries to get fileinfo for directory, thats why com_media crashes. before getting fileinfo, com_media should check if current string is file or not.