Home folder unavailable after upgrade til version 10

After upgrading to owncloud 10 (Ups.. update server via Ubuntu Landscape service) I have a single (know of) user that cannot access his home folder. Have other users that work fine.
strong text

occ files:scan username find alot of files'.
Starting scan for user 1 out of 1 (username)

+---------+-------+--------------+
| Folders | Files | Elapsed time |
+---------+-------+--------------+
| 568     | 4125  | 00:00:08     |
+---------+-------+--------------+

Steps to reproduce
1. Open owncloud web URL.
2. Logon with user.
3. No files are shown, and the error message "This folder is unavailable, please check the logs or contact the administrator" is shown. By clicking files shared with others, some folder can be shown anyway.

Expected behaviour
Show all files in home folder.

Actual behaviour
Empty folder are shown.

Server configuration
Operating system: Ubuntu 16.04 LTS
Web server: Nginx 1.12.0
Database: Percona (Mysql) 5.7.17-13-1.xenial
PHP version: 7.1.4
ownCloud version (see ownCloud admin page): 10.0.0.12
Updated from an older ownCloud or fresh install: 9.1.5
Special configuration (external storage): CIFS

ownCloud configuration

{
    "system": {
        "updatechecker": false,
        "instanceid": "oc242d6bc4is",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "owncloud.dom.lan"
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/owncloud.dom.lan",
        "dbtype": "mysql",
        "version": "10.0.0.12",
        "dbname": "euccloud",
        "dbhost": "localhost",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "ldapIgnoreNamingRules": false,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\APCu",
        "theme": "",
        "loglevel": 0,
        "mail_from_address": "owncloud",
        "mail_smtpmode": "smtp",
        "mail_domain": "dom.lan",
        "mail_smtphost": "exchange01.dom.lan",
        "mail_smtpport": "25",
        "maintenance": false
    }
}

ownCloud log (data/owncloud.log)

{"reqId":"1NWNaCYmrOngnaOhMQYE","level":3,"time":"2017-05-03T22:13:29+00:00","remoteAddr":"127.127.127.127","user":"username","app":"remote","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Exception: {\"Exception\":\"Error\",\"Message\":\"Call to a member function getPermissions() on array\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/Directory.php(272): OC\\\\Files\\\\View->getDirectoryContent('\\\/')\\n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/SharesPlugin.php(169): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory->getChildren()\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\SharesPlugin->handleGetProperties(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1058): Sabre\\\\Event\\\\EventEmitter->emit('propFind', Array)\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(980): Sabre\\\\DAV\\\\Server->getPropertiesByNode(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1665): Sabre\\\\DAV\\\\Server->getPropertiesIteratorForPath('', Array, 1)\\n#7 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(355): Sabre\\\\DAV\\\\Server->generateMultiStatus(Object(Generator), false)\\n#8 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpPropFind(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#9 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#10 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:PROPFIND', Array)\\n#11 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#12 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#13 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#14 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php\",\"Line\":1458}"}
{"reqId":"pQ6xEiLC2kYMbm0vctJs","level":3,"time":"2017-05-03T22:13:29+00:00","remoteAddr":"127.127.127.127","user":"username","app":"remote","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Exception: {\"Exception\":\"Error\",\"Message\":\"Call to a member function getPermissions() on array\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/Directory.php(272): OC\\\\Files\\\\View->getDirectoryContent('\\\/')\\n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/SharesPlugin.php(169): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory->getChildren()\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\SharesPlugin->handleGetProperties(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1058): Sabre\\\\Event\\\\EventEmitter->emit('propFind', Array)\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(980): Sabre\\\\DAV\\\\Server->getPropertiesByNode(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1665): Sabre\\\\DAV\\\\Server->getPropertiesIteratorForPath('', Array, 1)\\n#7 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(355): Sabre\\\\DAV\\\\Server->generateMultiStatus(Object(Generator), false)\\n#8 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpPropFind(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#9 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#10 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:PROPFIND', Array)\\n#11 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#12 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#13 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#14 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php\",\"Line\":1458}"}
{"reqId":"CPrV2Y63SrQoqqeA3YM1","level":0,"time":"2017-05-03T22:13:34+00:00","remoteAddr":"127.127.127.127","user":"username","app":"core","method":"REPORT","url":"\/remote.php\/webdav\/","message":"OC\\Tags::getFavorites, exception: Could not find category \"_$!<Favorite>!$_\""}
{"reqId":"dMUlc6mimnUzD8KqRgVJ","level":0,"time":"2017-05-03T22:13:45+00:00","remoteAddr":"127.127.127.127","user":"username","app":"webdav","method":"PROPFIND","url":"\/remote.php\/webdav\/Hjemmemappe","message":"Exception: {\"Message\":\"HTTP\\\/1.1 404 File with name Hjemmemappe could not be located\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\NotFound\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(966): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\ObjectTree->getNodeForPath('Hjemmemappe')\\n#1 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1665): Sabre\\\\DAV\\\\Server->getPropertiesIteratorForPath('Hjemmemappe', Array, 1)\\n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(355): Sabre\\\\DAV\\\\Server->generateMultiStatus(Object(Generator), false)\\n#3 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpPropFind(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:PROPFIND', Array)\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#7 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#8 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#9 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/ObjectTree.php\",\"Line\":182,\"User\":\"username\"}"}
{"reqId":"rQZPQn2TP3thR8o5riKR","level":3,"time":"2017-05-03T22:13:45+00:00","remoteAddr":"127.127.127.127","user":"username","app":"remote","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Exception: {\"Exception\":\"Error\",\"Message\":\"Call to a member function getPermissions() on array\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/Directory.php(272): OC\\\\Files\\\\View->getDirectoryContent('\\\/')\\n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/SharesPlugin.php(169): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory->getChildren()\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\SharesPlugin->handleGetProperties(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1058): Sabre\\\\Event\\\\EventEmitter->emit('propFind', Array)\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(980): Sabre\\\\DAV\\\\Server->getPropertiesByNode(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1665): Sabre\\\\DAV\\\\Server->getPropertiesIteratorForPath('', Array, 1)\\n#7 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(355): Sabre\\\\DAV\\\\Server->generateMultiStatus(Object(Generator), false)\\n#8 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpPropFind(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#9 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#10 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:PROPFIND', Array)\\n#11 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#12 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#13 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#14 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php\",\"Line\":1458}"}
{"reqId":"ZKP08Drxen1t2PqSAkRf","level":0,"time":"2017-05-03T22:13:49+00:00","remoteAddr":"127.127.127.127","user":"username","app":"webdav","method":"PROPFIND","url":"\/remote.php\/webdav\/Hjemmemappe","message":"Exception: {\"Message\":\"HTTP\\\/1.1 404 File with name Hjemmemappe could not be located\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\NotFound\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(966): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\ObjectTree->getNodeForPath('Hjemmemappe')\\n#1 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1665): Sabre\\\\DAV\\\\Server->getPropertiesIteratorForPath('Hjemmemappe', Array, 1)\\n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(355): Sabre\\\\DAV\\\\Server->generateMultiStatus(Object(Generator), false)\\n#3 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpPropFind(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:PROPFIND', Array)\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#7 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#8 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#9 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/ObjectTree.php\",\"Line\":182,\"User\":\"username\"}"}
{"reqId":"cb1iL1XZlvvvPd48a27x","level":3,"time":"2017-05-03T22:13:49+00:00","remoteAddr":"127.127.127.127","user":"username","app":"remote","method":"PROPFIND","url":"\/remote.php\/webdav\/","message":"Exception: {\"Exception\":\"Error\",\"Message\":\"Call to a member function getPermissions() on array\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/Directory.php(272): OC\\\\Files\\\\View->getDirectoryContent('\\\/')\\n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/SharesPlugin.php(169): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory->getChildren()\\n#2 [internal function]: OCA\\\\DAV\\\\Connector\\\\Sabre\\\\SharesPlugin->handleGetProperties(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1058): Sabre\\\\Event\\\\EventEmitter->emit('propFind', Array)\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(980): Sabre\\\\DAV\\\\Server->getPropertiesByNode(Object(Sabre\\\\DAV\\\\PropFind), Object(OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory))\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1665): Sabre\\\\DAV\\\\Server->getPropertiesIteratorForPath('', Array, 1)\\n#7 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(355): Sabre\\\\DAV\\\\Server->generateMultiStatus(Object(Generator), false)\\n#8 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpPropFind(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#9 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#10 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:PROPFIND', Array)\\n#11 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#12 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#13 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#14 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php\",\"Line\":1458}"}
{"reqId":"4uujbeJg7eBSpevgcZVj","level":1,"time":"2017-05-03T22:15:01+00:00","remoteAddr":"","user":"--","app":"cli","method":"--","url":"--","message":"Memcache \\OC\\Memcache\\APCu not available for local cache"}
{"reqId":"4uujbeJg7eBSpevgcZVj","level":1,"time":"2017-05-03T22:15:01+00:00","remoteAddr":"","user":"--","app":"cli","method":"--","url":"--","message":"Memcache \\OC\\Memcache\\APCu not available for distributed cache"}
{"reqId":"4uujbeJg7eBSpevgcZVj","level":0,"time":"2017-05-03T22:15:01+00:00","remoteAddr":"","user":"--","app":"cron","method":"--","url":"--","message":"Started background job of class : OCA\\Files\\BackgroundJob\\ScanFiles with arguments : "}

Integrity status for oC9+

No errors have been found.

Is this a local user or an LDAP user?

Have you checked the "oc_shares" table in your database?

You could try to transfer ownership to this user with an occ command.