2 files changed, 6 insertions, 2 deletions
diff --git a/lib/gitlab/view/presenter/base.rb b/lib/gitlab/view/presenter/base.rb
index 83c8ba5c1cf..dbfe0941e4d 100644
--- a/lib/gitlab/view/presenter/base.rb
+++ b/lib/gitlab/view/presenter/base.rb
@@ -1,6 +1,8 @@
 module Gitlab
   module View
     module Presenter
+      CannotOverrideMethodError = Class.new(StandardError)
+
       module Base
         extend ActiveSupport::Concern
 
diff --git a/lib/gitlab/view/presenter/delegated.rb b/lib/gitlab/view/presenter/delegated.rb
index fd90f7c2bad..387ff0f5d43 100644
--- a/lib/gitlab/view/presenter/delegated.rb
+++ b/lib/gitlab/view/presenter/delegated.rb
@@ -8,9 +8,11 @@ module Gitlab
           @subject = subject
 
           attributes.each do |key, value|
-            unless subject.respond_to?(key)
-              define_singleton_method(key) { value }
+            if subject.respond_to?(key)
+              raise CannotOverrideMethodError.new("#{subject} already respond to #{key}!")
             end
+
+            define_singleton_method(key) { value }
           end
 
           super(subject)