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 ('9d66fb9c8db22e288c9155ae6fc1d1cc', -1, 1711688957, 1711688957, '36f216f7', 0, 0, 0)

Line : 187
File : sessions.php