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 ('e9b6f52eb2a778e8634a13b5d1d89d4f', -1, 1714611851, 1714611851, '0390670a', 10, 0, 0)

Line : 187
File : sessions.php