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 ('0c2512e14ff33c260de8f2fc94c491c9', -1, 1711616607, 1711616607, '36ade554', -10, 0, 0)

Line : 187
File : sessions.php