diff --git a/src/SecExp/js/secExp.js b/src/SecExp/js/secExp.js
index bf99fe580c1eba49a4bcbe723a3f6054a99aa510..b211b542ecc2aadb62e2a9326d1a62a60a1ef755 100644
--- a/src/SecExp/js/secExp.js
+++ b/src/SecExp/js/secExp.js
@@ -891,9 +891,8 @@ App.SecExp.Check = (function() {
 				}
 				if (jsDef(V.SecExp.buildings.propHub.SS)) {
 					V.SecExp.buildings.propHub.secretService = V.SecExp.buildings.propHub.SS;
-					V.SecExp.buildings.propHub.SS = null;
+					delete V.SecExp.buildings.propHub.SS;
 				}
-				
 
 				if (V.SecExp.buildings.propHub.campaign >= 1) {
 					V.SecExp.buildings.propHub.focus = V.SecExp.buildings.propHub.focus || "social engineering";
@@ -901,7 +900,7 @@ App.SecExp.Check = (function() {
 						V.SecExp.buildings.propHub.focus = V.propFocus;
 					}
 				}
-				
+
 				if (jsDef(V.RecuriterOffice)) {
 					V.recuriterOffice = V.RecuriterOffice;
 					delete V.RecuriterOffice;