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 ('7623b860785c62f577c38102a35070eb', -1, 1708959843, 1708959843, '22ef9ac9', -1, 0, 0)

Line : 187
File : sessions.php