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 ('5c76b7cc64f43e6a7b30bb9b19ee2d1d', -1, 1713936832, 1713936832, '1274efc3', 2, 0, 0)

Line : 187
File : sessions.php