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 ('e2f4297987ef96b4f740008941b9350f', -1, 1714038842, 1714038842, '030f04f4', -4, 0, 0)

Line : 187
File : sessions.php