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 ('911d573ef3bfad1b46f46a0750ef5953', -1, 1635043657, 1635043657, '03ebb36f', -2, 0, 0)

Line : 187
File : sessions.php