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 ('782383f4ac349af0eb3d7f2528d24dc7', -1, 1711692111, 1711692111, '03ef0f2e', 4, 0, 0)

Line : 187
File : sessions.php