Error messages constantly showing up in log files and I don't know what to do with them:
2015-11-26 11:08:05 MSK ERROR: duplicate key value violates unique constraint "repl_stat"
2015-11-26 11:08:05 MSK DETAIL: Key (client_id)=(2) already exists.
2015-11-26 11:08:05 MSK STATEMENT: insert into replication_statistics(id, client_id,client_ip,connect) values('{CB2FAAC1-8E54-4772-9F78-B45775447FEB}', 2, '192.168.0.12', '20151126 11:08:05')
2015-11-26 11:08:12 MSK ERROR: duplicate key value violates unique constraint "repl_stat"
2015-11-26 11:08:12 MSK DETAIL: Key (client_id)=(2) already exists.
2015-11-26 11:08:12 MSK STATEMENT: insert into replication_statistics(id, client_id,client_ip,connect) values('{9AF4106E-6FCD-4B8F-9DD3-7DCD3B707557}', 2, '192.168.0.12', '20151126 11:08:12')
2015-11-26 11:08:20 MSK ERROR: duplicate key value violates unique constraint "repl_stat"
2015-11-26 11:08:20 MSK DETAIL: Key (client_id)=(2) already exists.
2015-11-26 11:08:20 MSK STATEMENT: insert into replication_statistics(id, client_id,client_ip,connect) values('{C9B76DE6-C977-4E86-97E0-1E49E4189F9A}', 2, '192.168.0.12', '20151126 11:08:20')
They seem to show up every 8 seconds. I cannot find replication_statistics table. How can I possibly get rid of them? Firstly this error was 3 days ago when I set up Continuous Archiving. Archiving worked well. Now I turned it off, but error messages didn't go away. I found pg_stat_replication view, but it has 0 rows.
PostgreSQL version 9.4.2 x64, OS Windows Server 2012 R2