phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'fff21336aa6d29be9f37f5b1a33e07d4' 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 ('fff21336aa6d29be9f37f5b1a33e07d4', -1, 1764813626, 1764813626, 'd849d8de', -4, 0, 0)

Line : 187
File : sessions.php