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 ('2b410d8b3c6e68756e696088b32c9be0', -1, 1730418331, 1730418331, '0389a756', -1280, 0, 0)

Line : 195
File : sessions.php