修改settings/show.json

app/views/settings/show.json.jbuilder

@@ -1,6 +1,6 @@
 json.setting do
+  if @laboratory.present?
     setting = @laboratory.laboratory_setting
-
     json.name setting.name || default_setting.name
     json.nav_logo_url (setting.nav_logo_url || default_setting.nav_logo_url)&.[](1..-1)
     json.login_logo_url (setting.login_logo_url || default_setting.login_logo_url)&.[](1..-1)
@@ -17,4 +17,7 @@ json.setting do
     json.footer setting.footer || default_setting.footer
 
     json.main_site current_laboratory.main_site?
+  end
+
+
 end