Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7

Error message:
Error listing directory '/var/www/ocko.tv'.

Unexpected directory listing line ''.
Range check error

Stack trace:
[00AE0C49]
[00AE217C]
[0097A612]
[00987556]
[00986F10]
[00A116DB]
[00A10D15]
[00A10194]
[00912424] @TUnixDirView@ReloadDirectory$qqrv
[00333B54]
[00682740]
[0046A2A1]
[00725416] @Tb2item@TTBPopupMenu@IsShortCut$qqrr22Winapi@Messages@TWMKey