phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5f5b8b6e9f2b07515c25fcae3a527365' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5f5b8b6e9f2b07515c25fcae3a527365', -1, 1412158300, 1412158300, '36521b8d', -1, 0, 0)

Line : 187
File : sessions.php