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 ('c12e7a6cae64e0f325e5c3cf802e626e', -1, 1711687911, 1711687911, '23afc8c7', 6, 0, 0)

Line : 187
File : sessions.php