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 ('1677c1a96da09097f4cf9952c2d630b8', -1, 1713259906, 1713259906, '127711cf', -10, 0, 0)

Line : 187
File : sessions.php