Unlink : operation not permitted

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Nextcloud version : 13.0.4
Operating system and version : Debian 9
Apache or nginx version : nginx 1.10.3
PHP version : 7.0

Hello,

I have upgrade Nextcloud from 13.0.1 to 13.0.4, and I have strange messages in the Logging panel:

|Error|PHP|unlink(/tmp/oc_tmp_ikmXSR-.crt): Operation not permitted at /var/www/nextcloud/lib/private/legacy/helper.php#224|2018-06-25T13:43:31-0700|

|Error|PHP|unlink(/tmp/oc_tmp_ikmXSR): Operation not permitted at /var/www/nextcloud/lib/private/legacy/helper.php#224|2018-06-25T13:43:31-0700|

I understand that there can be a problem of permission but I really don’t know what and where. Everything else seem to work.

Any idea ?

Here is the output of my config.php

<?php
$CONFIG = array (
  'instanceid' => 'lololol',
  'passwordsalt' => 'lololol',
  'secret' => 'lololol+Vo+er5IMDb6jpvE5',
  'trusted_domains' => 
  array (
    0 => 'localhost',
    1 => 'cloud.lololol.org',
  ),
  'datadirectory' => '/home/data/cloud',
  'overwrite.cli.url' => 'localhost',
  'dbtype' => 'mysql',
  'version' => '13.0.4.0',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'nextcloud',
  'dbpassword' => 'lololol',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'maintenance' => false,
  'redis' => array (
    'host' => 'localhost',
    'port' => 6379,
  ),
  'theme' => '',
  'loglevel' => 2,
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/var/www/nextcloud/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 => 
    array (
      'path' => '/var/www/nextcloud/apps2',
      'url' => '/apps2',
      'writable' => true,
    ),
  ),
  'updater.secret' => 'lololol',
);

Thanks !