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 ('2884ac367b66d270ab52d1097a8f5411', -1, 1713918172, 1713918172, '03156a45', 4, 0, 0)

Line : 187
File : sessions.php