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 ('ca31e83b8f7a71e54d4c42658577dd76', -1, 1711616757, 1711616757, '2ccee341', -11, 0, 0)

Line : 187
File : sessions.php