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 ('398dbf4ff7c837627d421ffeadbb7e1e', -1, 1711708847, 1711708847, '03edeb94', 3, 0, 0)

Line : 187
File : sessions.php