diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index d670e9a0d..a54d345fa 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -148,9 +148,9 @@ module ApplicationHelper
     if File.exist?(disk_filename(source&.class, source&.id))
       ctime = File.ctime(disk_filename(source.class, source.id)).to_i
       if %w(User Organization).include?(source.class.to_s)
-        File.join("images", relative_path, ["#{source.class}", "#{source.id}"]) + "?t=#{ctime}"
+        File.join("images", relative_path, ["#{source.class}", "#{source&.id}"]) + "?t=#{ctime}"
       else
-        File.join("images/avatars", ["#{source.class}", "#{source.id}"]) + "?t=#{ctime}"
+        File.join("images/avatars", ["#{source.class}", "#{source&.id}"]) + "?t=#{ctime}"
       end
     elsif source.class.to_s == 'User'
       source.get_letter_avatar_url
diff --git a/app/views/api/v1/issues/_detail.json.jbuilder b/app/views/api/v1/issues/_detail.json.jbuilder
index 8b5ff5949..941245b8c 100644
--- a/app/views/api/v1/issues/_detail.json.jbuilder
+++ b/app/views/api/v1/issues/_detail.json.jbuilder
@@ -27,18 +27,10 @@ json.milestone do
   end
 end
 json.author do
-  if issue.user.present? 
-    json.partial! "api/v1/users/simple_user", locals: {user: issue.user}
-  else 
-    json.nil! 
-  end
+  json.partial! "api/v1/users/simple_user", locals: {user: issue.user}
 end
 json.changer do 
-  if issue.changer.present? 
-    json.partial! "api/v1/users/simple_user", locals: {user: issue.changer}
-  else 
-    json.nil! 
-  end
+  json.partial! "api/v1/users/simple_user", locals: {user: issue.changer}
 end
 json.assigners issue.show_assigners.each do |assigner| 
   json.partial! "api/v1/users/simple_user", locals: {user: assigner}
diff --git a/app/views/api/v1/users/_simple_user.json.jbuilder b/app/views/api/v1/users/_simple_user.json.jbuilder
index 5e8e970e7..f79729046 100644
--- a/app/views/api/v1/users/_simple_user.json.jbuilder
+++ b/app/views/api/v1/users/_simple_user.json.jbuilder
@@ -4,6 +4,7 @@ if user.present?
   json.name user.real_name
   json.login user.login
   json.image_url Rails.application.config_for(:configuration)['platform_url'] + "/" + url_to_avatar(user).to_s
-else 
-  json.nil!
+else
+  json.name "已注销"
+  json.login ""
 end
\ No newline at end of file