phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c52bc3ab8d03a62cc2b24ca8947ede81' 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 ('c52bc3ab8d03a62cc2b24ca8947ede81', -1, 1412245758, 1412245758, '36d3929b', -9, 0, 0)

Line : 187
File : sessions.php