fixes exception when not logged in

app/controllers/application_controller.rb

@@ -34,7 +34,7 @@ class ApplicationController < ActionController::Base
     end
 
     def authenticate_beta_tester!
-      unless beta_testers.include?(current_user.email)
+      unless signed_in? && beta_testers.include?(current_user.email)
         sign_out(current_user)
         redirect_to new_user_session_path, alert: t('application.alert.only_beta_testers')
       end

spec/features/beta_testers_spec.rb

@@ -34,4 +34,11 @@ feature 'Beta testers' do
     expect(page).to have_content "Sorry only Beta Testers are allowed access at the moment"
   end
 
+  scenario "Trying to access site without being logged in" do
+    visit debates_path
+
+    expect(page).to have_content "Sorry only Beta Testers are allowed access at the moment"
+    expect(current_path).to eq(new_user_session_path)
+  end
+
 end