phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ff968534189a020961252d70af0a86c5' for key 'PRIMARY'

INSERT INTO sub_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('ff968534189a020961252d70af0a86c5', -1, 1771955137, 1771955137, 'd849d86b', -4, 0, 0)

Line : 187
File : sessions.php