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 ('964de6c81e1e51c563c13f658aa9704a', -1, 1711689606, 1711689606, '22e5ac56', -10, 0, 0)

Line : 187
File : sessions.php