Php error while trying to download file related to setcookie()

[ctrlaltca]

setcookie(): "path" option cannot contain ",", ";", " ", "\t", "\r", "\n", "\013", or "\014" (Error Code: 0)
vendor/studio-42/elfinder/php/elFinder.class.php (2085)

This is the same as issue #3538
It was fixed by #3561
Then the change was reverted in #3619
I'm not sure about the problem fixed by #3619, as there's no related issue or explanation on the change.