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 ('cf1695f36611183205ec8559a9e7a8fc', -1, 1711677631, 1711677631, '641a236f', -4, 0, 0)

Line : 187
File : sessions.php