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 ('946cf36a0de1b06f0bd183129da1ff5c', -1, 1730418596, 1730418596, '1277a23b', 2, 0, 0)

Line : 195
File : sessions.php