diff --git a/errors.js b/errors.js
index 0651b4fff..68509520d 100644
--- a/errors.js
+++ b/errors.js
@@ -15,6 +15,10 @@ const ErrEmailTaken = new Error('Email address already in use');
 ErrEmailTaken.translation_key = 'EMAIL_IN_USE';
 ErrEmailTaken.status = 400;
 
+const ErrEmailDisplaynameTaken = new Error('Email or Display name already in use');
+ErrEmailDisplaynameTaken.translation_key = 'EMAIL_DISPLAYNAME_IN_USE';
+ErrEmailDisplaynameTaken.status = 400;
+
 const ErrSpecialChars = new Error('No special characters are allowed in a display name');
 ErrSpecialChars.translation_key = 'NO_SPECIAL_CHARACTERS';
 ErrSpecialChars.status = 400;