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 ('b1af9b09236cdc668dbcf615da4078ce', -1, 1714810880, 1714810880, '030c47ed', -7, 0, 0)

Line : 187
File : sessions.php