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 ('1e311c394187a2cb3115f83594532f4f', -1, 1711722469, 1711722469, '0350ad19', -4, 0, 0)

Line : 187
File : sessions.php