phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('3de6fe71e41bf1b6ee9a3e90d0f94ed0', -1, 1708806747, 1708806747, '03eb916c', -4, 0, 0)

Line : 187
File : sessions.php