phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'bd6c8158608ca177b50243d4b7425da1' 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 ('bd6c8158608ca177b50243d4b7425da1', -1, 1422361186, 1422361186, '36e30962', 12, 0, 0)

Line : 187
File : sessions.php