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 ('264d0cf84e6f39bcd84c8a18c3d8a7b2', -1, 1713424448, 1713424448, '1276cdba', 0, 0, 0)

Line : 187
File : sessions.php