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 ('9fd8c4e07116b385256b6798a9a5f7e6', -1, 1711670806, 1711670806, '345ad38d', -9, 0, 0)

Line : 187
File : sessions.php