phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8a0a0c9b4947324db60cf123f4dc3327' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8a0a0c9b4947324db60cf123f4dc3327', -1, 1406791696, 1406791696, '36e3b6bf', 3, 0, 0)

Line : 187
File : sessions.php