1 files changed, 1 insertions, 12 deletions
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index 5ee6f2056e..3d560518e1 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -153,7 +153,7 @@ module Mime
       end
 
       def lookup_by_extension(extension)
-        EXTENSION_LOOKUP[extension.to_s] || NullMimeTypeObject.new
+        EXTENSION_LOOKUP[extension.to_s]
       end
 
       # Registers an alias that's not used on mime type lookup, but can be referenced directly. Especially useful for
@@ -301,17 +301,6 @@ module Mime
         method.to_s.ends_with? '?'
       end
   end
-
-  class NullMimeTypeObject
-    private
-    def method_missing(method, *args)
-      if method.to_s.ends_with? '?'
-        false
-      else
-        super
-      end
-    end
-  end
 end
 
 require 'action_dispatch/http/mime_types'