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 ('a40e0d2e1b8cb175b523ed68148743b7', -1, 1713523812, 1713523812, '1276c888', -2, 0, 0)

Line : 187
File : sessions.php