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 ('c2cbe7c16d22e5deee78f706b8bd3ffc', -1, 1711718406, 1711718406, '2cc63909', 3, 0, 0)

Line : 187
File : sessions.php