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 ('21f75f70571f2aa51b24e97afc398979', -1, 1709563983, 1709563983, '641ac4de', -8, 0, 0)

Line : 187
File : sessions.php