Invalid backend response. Error occurred on the server side. HTTP error 500 due to 12 directories and 115888 files in /home/user

[jaimbh]

Whenever I open /home/user using elfinder, it gives:
Invalid backend response.
Error occurred on the server side.
HTTP error 500

This is happening because /home/user has 12 directories and 115888 files. The /home/user has a size of 5.5gb.
What do I need to add in the elfinder.php configuration file or any other file to solve this?

Below is $opts array in elfinder.php:
'roots' => array(
// Items volume
array(
'driver' => 'LocalFileSystem',
'path' => $user['homedir'],
'statOwner' => true,
'uploadAllow' => array('all'),
'uploadOrder' => array('allow', 'deny'),
'acceptedName' => 'validName',
'tmbPath' => '',
'maxArcFilesSize' => 'unlimited',
),