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 ('c038c9068ea7282fba2fc1e2f5b297af', -1, 1709252091, 1709252091, '2cdc3eb7', -7, 0, 0)

Line : 187
File : sessions.php