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 ('9b6b9969a765a1e2462ec10eaeb7b0b1', -1, 1711655319, 1711655319, '36d27ee8', -4, 0, 0)

Line : 187
File : sessions.php