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 ('3e9d2de012a643c9e7ff346038d14f28', -1, 1709650451, 1709650451, '2cdc3eb7', -7, 0, 0)

Line : 187
File : sessions.php