Fixed for a @project check if this is used in the context of a group

app/helpers/license_helper.rb

@@ -75,8 +75,10 @@ module LicenseHelper
   end
 
   def upgrade_plan_url
-    if  @project.group
+    if @project && @project.group
       group_billings_path(@project.group)
+    elsif @group
+        group_billings_path(@group)
     else
       profile_billings_path
     end

ee/app/views/shared/promotions/_promotion_link_project.html.haml

 - short_form = local_assigns.fetch :short_form, false
 - if current_application_settings.should_check_namespace_plan?
-  - if can?(current_user, :admin_namespace, @project.namespace)
+  - if (@project && can?(current_user, :admin_namespace, @project.namespace)) || (@group && can?(current_user, :admin_group, @group))
     = link_to 'Upgrade your plan', upgrade_plan_url, class: 'btn btn-primary'
-  - elsif @project.group
+  - elsif @project && @project.group
     %p Contact an owner of group #{ @project.group.name } to upgrade the plan.
-  - else
+  - elsif @group
+    %p Contact an owner of group #{ @group.name } to upgrade the plan.
+  - elsif @project
     - owner = @project.namespace.owner
     %p Contact owner #{ link_to(owner.name, user_path(owner)) } to upgrade the plan.
 - elsif current_user&.admin?