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 ('2819c8ca457ca4c957e0b8d94de4a8a1', -1, 1711679945, 1711679945, '641a236f', -4, 0, 0)

Line : 187
File : sessions.php