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MethodErrorについて

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プログラミング初心者です。現在ユーザーログインページを開発中なのですが、form_tagめぞっどを使うと
NoMethodError in User#edit
Showing /home/ubuntu/workspace/app/views/user/edit.html.erb where line #2 raised:
undefined method `id' for nil:NilClass
Extracted source (around line #2):
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編集フォームはこちら

<%= form_tag("/users/#{@user.id}/update") do %>

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Rails.root: /home/ubuntu/workspace
Application Trace | Framework Trace | Full Trace
app/views/user/edit.html.erb:2:in `app_views_user_edit_html_erb__220649719522465576_70041070436860'
Request
Parameters:
{"id"=>":id"}
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Response
Headers:
None
とでてしまいます。controllerの入力も間違えがないはずなのですが、どなたか助言をいただけませんか?

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