PDOException: SQLSTATE[42S02]: Base table or view not found db.og_membership

Using Organic Groups 7.x-2.7. Whenever I set subdomain module for Organic Groups and go to the front page or any other page I get an error message:

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'db.og_membership' doesn't exist: SELECT gid FROM og_membership WHERE field_name = 'og_group_ref' AND etid = :nid LIMIT 1; Array ( [:nid] => 202 ) in subdomain_mode_group->get_content_subdomain() (Zeile 37 von /sites/all/modules/subdomain/includes/subdomain_mode_group.inc).

I then tried to set up subdomains for users. With user-subdomains everythings fine.