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 ('f04cd7398dfb8849050a8d7b543c0769', -1, 1555613895, 1555613895, '3437bae1', -4, 0, 0)

Line : 187
File : sessions.php