[이 q2a 가져오기 스크립트](https://gist.github.com/[Communiteq](https://www.communiteq.com) (formerly DiscourseHosting)/769eff2014d5482f0ab776de03dc3349)를 사용 중인데 아래 오류가 발생합니다. 이 문제를 해결하는 방법을 알려주세요.
제 사용자 데이터베이스 문제일까요, 아니면 스크립트 문제일까요? 어떻게 수정해야 할까요? 감사합니다!
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importing users
80 / 447 ( 17.9%) [208 items/min] Traceback (most recent call last):
12: from script/import_scripts/question2answer.rb:601:in `<main>'
11: from /var/www/discourse/script/import_scripts/base.rb:47:in `perform'
10: from script/import_scripts/question2answer.rb:70:in `execute'
9: from script/import_scripts/question2answer.rb:89:in `import_users'
8: from /var/www/discourse/script/import_scripts/base.rb:877:in `batches'
7: from /var/www/discourse/script/import_scripts/base.rb:877:in `loop'
6: from /var/www/discourse/script/import_scripts/base.rb:878:in `block in batches'
5: from script/import_scripts/question2answer.rb:106:in `block in import_users'
4: from /var/www/discourse/script/import_scripts/base.rb:247:in `create_users'
3: from /var/www/discourse/script/import_scripts/base.rb:247:in `each'
2: from /var/www/discourse/script/import_scripts/base.rb:259:in `block in create_users'
1: from /var/www/discourse/script/import_scripts/base.rb:290:in `create_user'
/var/www/discourse/script/import_scripts/base.rb:393:in `find_existing_user': undefined method `downcase' for nil:NilClass (NoMethodError)