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 ('856240f15ecc0e0523a1a88b381080b9', -1, 1713871688, 1713871688, '038cf2a5', -8, 0, 0)

Line : 187
File : sessions.php