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 ('f817a3e2605b80e6309c9874f09a1624', -1, 1714034778, 1714034778, '030fcad6', -4, 0, 0)

Line : 187
File : sessions.php