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 ('a38949b4448efe2c3f80d1c52b3611ac', -1, 1714041038, 1714041038, '038b4683', -7, 0, 0)

Line : 187
File : sessions.php