diff --git a/src/events/intro/customizeSlaveTrade/customizeSlaveTrade.js b/src/events/intro/customizeSlaveTrade/customizeSlaveTrade.js
index b2fcabbea86d509fdb0efefedfdc056abd092574..0967be7a4b4b1133c861aacc63f97111be11fee2 100644
--- a/src/events/intro/customizeSlaveTrade/customizeSlaveTrade.js
+++ b/src/events/intro/customizeSlaveTrade/customizeSlaveTrade.js
@@ -372,7 +372,7 @@ App.UI.CustomSlaveTrade = function() {
 				App.UI.DOM.link(
 					name,
 					() => {
-						V.nationalities = nationalities;
+						V.nationalities = clone(nationalities);
 						refresh();
 					}
 				)