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 ('ac2d610af67d1fb2d1717b23e30b9ccc', -1, 1711671839, 1711671839, '03516125', -8, 0, 0)

Line : 187
File : sessions.php