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 ('6a0b5031f6055f07e69460476c7e3b60', -1, 1713556001, 1713556001, '03919c2e', -4, 0, 0)

Line : 187
File : sessions.php