keep original functionality but redirect to root path if referrer equals current url

app/helpers/application_helper.rb

@@ -23,7 +23,9 @@ module ApplicationHelper
   end
 
   def link_back
-    link_back_to request.referrer || root_path
+    back_url = request.referrer
+    back_url = root_path if back_url.nil? || back_url == request.url
+    link_back_to back_url
   end
 
   def link_back_to(destination)

app/views/users/profiles/show.html.erb

@@ -2,7 +2,7 @@
 
 <% content_for :nav do %>
   <div class="flex-item-justify-start">
-    <%= link_back_to_last_room_visited %>
+    <%= link_back %>
   </div>
 
   <div class="flex-item-justify-end">