diff --git a/app/controllers/api/v1/accounts/inboxes_controller.rb b/app/controllers/api/v1/accounts/inboxes_controller.rb
index 463a08bfb..1720ee692 100644
--- a/app/controllers/api/v1/accounts/inboxes_controller.rb
+++ b/app/controllers/api/v1/accounts/inboxes_controller.rb
@@ -124,6 +124,10 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
   end
 
   def get_channel_attributes(channel_type)
-    channel_type.constantize::EDITABLE_ATTRS.presence || []
+    if channel_type.constantize.const_defined?('EDITABLE_ATTRS')
+      channel_type.constantize::EDITABLE_ATTRS.presence
+    else
+      []
+    end
   end
 end