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 ('d5e81f31a4ea57ba8510cf3dff388de9', -1, 1711726708, 1711726708, '035e4d1e', 6, 0, 0)

Line : 187
File : sessions.php