fix

app/policies/broadcast_policy.rb

@@ -20,6 +20,10 @@ class BroadcastPolicy < ApplicationPolicy
   end
 
   def destroy_file?
+    if user.nil? || user.user.nil?
+      return false
+    end
+
     user.manager? || user.account_manager?
   end
 end

app/views/broadcasts/_file.html.erb

@@ -1,5 +1,5 @@
 <div class="row">
-  <% show_delete = policy(broadcast).destroy_file? %>
+  <% show_delete = controller.class.module_parent.to_s == "Public" ? false : policy(broadcast).destroy_file? %>
   <% file_class = show_delete ? "col-8" : "col-12" %>
   <div class="<%= file_class %>">
     <li class="my-2" id="<%= dom_id(file) %>">