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 ('d1ddae7e169392ec77a69a4ab8dbfb8b', -1, 1711631978, 1711631978, '2ccc41bd', -10, 0, 0)

Line : 187
File : sessions.php