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 ('acf23e5c6355c1141d4aab1077be4912', -1, 1634977867, 1634977867, '23acd9ae', -2, 0, 0)

Line : 187
File : sessions.php