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 ('9776f09962247485f8c8013d6142b16c', -1, 1713978191, 1713978191, '2cc96100', -4, 0, 0)

Line : 187
File : sessions.php