[gollem] Gollem doesn't show filename with characters

[Marcus Vinicius]

Hello,
I have a Horde 2.105 with Gollem 1.20 woking on a Debian 4.
Everything is working fine.
But I need to upgrade the whole system and I'm trying to setup a Gollem 5.2.20 with the last Gollem available.
I've configured the Gollem app for web FTP file management, but it can't manager filenames that have Portuguese characters. 
On WinSCP I can see the files with no problem. But with Gollem the filename was blank. I cant' see, or delete files and folders. 
Problematic files on Linux: 
# ls -latotal 66860-rw-r--r--. 1 ftp 65534 25734935 Dec 10  2016 Apresenta??es pelo Balc?o.rar-rw-r--r--. 1 ftp 65534 16990859 Dec 16  2017 Reuni?o 14.12.17.rar
Problematic files on FTP: 
# ftp localhostTrying ::1...Connected to localhost (::1).220 FTP Server ready.Name (localhost:root): superuser331 Password required for superuserPassword:230 User superuser logged inRemote system type is UNIX.Using binary mode to transfer files.ftp> cd PUBLICO250 CWD command successfulftp> dir229 Entering Extended Passive Mode (|||55786|)150 Opening ASCII mode data connection for file list-rw-r--r--   1 superuser 65534    25734935 Dec 10  2016 Apresenta▒▒es pelo Balc▒o.rar-rw-r--r--   1 superuser 65534    16990859 Dec 16  2017 Reuni▒o 14.12.17.rar226 Transfer complete
These are exactly the same files that the old Gollem is showing correctly. But the new one is show a blank space in the name field.
Logs: 2019-03-08T13:22:37+00:00 DEBUG: HORDE Load config file (conf.php; app: horde) [pid 30222 on line 110 of "/usr/share/pear/Horde/Registry/Loadconfig.php"]2019-03-08T13:22:37+00:00 DEBUG: HORDE [gollem] Load config file (conf.php; app: gollem) [pid 30222 on line 110 of "/usr/share/pear/Horde/Registry/Loadconfig.php"]2019-03-08T13:22:37+00:00 DEBUG: HORDE [gollem] Load config file (mime_drivers.php; app: horde) [pid 30222 on line 110 of "/usr/share/pear/Horde/Registry/Loadconfig.php"]2019-03-08T13:22:37+00:00 WARN: HORDE [gollem] PHP ERROR: json_encode(): Invalid UTF-8 sequence in argument [pid 30222 on line 244 of "/usr/share/pear/Horde/Serialize.php"]2019-03-08T13:22:37+00:00 DEBUG: HORDE 1. Horde::popupJs() /usr/share/horde/gollem/manager.php:4732. Horde::escapeJson() /usr/share/pear/Horde.php:12473. Horde_Serialize::serialize() /usr/share/pear/Horde.php:3324. Horde_Serialize::_serialize() /usr/share/pear/Horde/Serialize.php:665. json_encode() /usr/share/pear/Horde/Serialize.php:2446. Horde_ErrorHandler::errorHandler()
2019-03-08T13:22:37+00:00 WARN: HORDE [gollem] PHP ERROR: json_encode(): Invalid UTF-8 sequence in argument [pid 30222 on line 244 of "/usr/share/pear/Horde/Serialize.php"]2019-03-08T13:22:37+00:00 DEBUG: HORDE 1. Horde::popupJs() /usr/share/horde/gollem/manager.php:4732. Horde::escapeJson() /usr/share/pear/Horde.php:12473. Horde_Serialize::serialize() /usr/share/pear/Horde.php:3324. Horde_Serialize::_serialize() /usr/share/pear/Horde/Serialize.php:665. json_encode() /usr/share/pear/Horde/Serialize.php:2446. Horde_ErrorHandler::errorHandler()
2019-03-08T13:22:37+00:00 DEBUG: HORDE [gollem] Max memory usage: 8388608 bytes [pid 30222 on line 613 of "/usr/share/pear/Horde/Registry.php"]


Is there any configuration to solve this? 
Thank you very much.


Marcus Vinicius