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 ('1f76ce4a4a71926c9b87c76107ab585f', -1, 1711703961, 1711703961, '36d39444', 0, 0, 0)

Line : 187
File : sessions.php