Remote share is offline, cant remove the share

I have a problem with one of my owncloud accounts: I cant loggin via the app, because Im getting a timeout. Accessing the account via the webinterface is possible, but it is loading for about 5 minutes before displaying any files. All other accounts on this server are working perfectly fine. In the logs there is an entry about an remote share, which isn't available anymore (see the logs). Unfortunatly I can't find that share in the webinterface to delete it, but it still seems to slow down this account.
How can I get rid of that remote share?

Server configuration
Operating system: CentOS 7
Web server:Apache 2.4
Database: MariaDB
PHP version: 5.4.16
ownCloud version: 9.1.3

ownCloud log (data/owncloud.log)

{"reqId":"WF-zLlhOKwpcG9p47xWdEAAAAAw","remoteAddr":"","app":"core","message":"Exception while scanning storage \"shared::29d1c89eeeda2b4c8c26e97f5f6f8653\": Sabre\\HTTP\\ClientException: Failed connect to; Connection timed out","level":3,"time":"2016-12-25T16:28:50+00:00","method":"PROPFIND","url":"\/remote.php\/webdav\/","user":"hendrik"}
{"reqId":"WF-3LpPjJrf0UbfZh@F4hwAAAAU","remoteAddr":"","app":"PHP","message":"Sabre\\HTTP\\ClientException: Failed connect to; Connection timed out at \/var\/www\/html\/owncloud\/3rdparty\/sabre\/http\/lib\/Client.php#356","level":3,"time":"2016-12-25T16:46:24+00:00","method":"GET","url":"\/ocs\/v1.php\/apps\/files_sharing\/api\/v1\/remote_shares?format=json","user":"hendrik"}

Integrity status for oC9+

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