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 ('351f4d82e61865e0f0a0d55b2848a55f', -1, 1713557409, 1713557409, '0381171e', -4, 0, 0)

Line : 187
File : sessions.php