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 ('791b829e36926986c388bf05dc1d2097', -1, 1711621676, 1711621676, '2cc03522', -10, 0, 0)

Line : 187
File : sessions.php