phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c8c31fa30333c00a2f07a8b8845f66ac' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c8c31fa30333c00a2f07a8b8845f66ac', -1, 1763764360, 1763764360, 'd849d882', -4, 0, 0)

Line : 187
File : sessions.php