diff --git a/admin/lib/solidus_admin/install_tailwindcss.rb b/admin/lib/solidus_admin/install_tailwindcss.rb
index d6267684cf9..1b882a068ed 100644
--- a/admin/lib/solidus_admin/install_tailwindcss.rb
+++ b/admin/lib/solidus_admin/install_tailwindcss.rb
@@ -73,7 +73,9 @@
   end
 RUBY
 
-append_file ".gitignore", "app/assets/builds/solidus_admin/"
+if Rails.root.join(".gitignore").exist?
+  append_file ".gitignore", "app/assets/builds/solidus_admin/"
+end
 
 unless Rails.root.join("Procfile.dev").exist?
   create_file "Procfile.dev", <<~YAML
diff --git a/core/lib/generators/solidus/install/install_generator.rb b/core/lib/generators/solidus/install/install_generator.rb
index c8c16452dfa..44794d4b35e 100644
--- a/core/lib/generators/solidus/install/install_generator.rb
+++ b/core/lib/generators/solidus/install/install_generator.rb
@@ -179,7 +179,9 @@ def install_solidus_admin
       return unless options[:admin_preview]
 
       say_status :installing, "SolidusAdmin", :blue
-      bundle_command 'add solidus_admin -v ">= 0.2"'
+      unless File.read(app_path.join('Gemfile')).include?('solidus_admin')
+        bundle_command 'add solidus_admin -v ">= 0.2"'
+      end
       generate 'solidus_admin:install'
     end