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 ('2137eb5a3ae31f0f2956b7c37f1f00dc', -1, 1713516172, 1713516172, '030f8fb5', -4, 0, 0)

Line : 187
File : sessions.php