diff --git a/src/SecExp/js/secExp.js b/src/SecExp/js/secExp.js
index dd93f42c1e435e80f07488b98e3cdcfe175715a9..bf99fe580c1eba49a4bcbe723a3f6054a99aa510 100644
--- a/src/SecExp/js/secExp.js
+++ b/src/SecExp/js/secExp.js
@@ -859,9 +859,12 @@ App.SecExp.Check = (function() {
 			V.SecExp.buildings = V.SecExp.buildings || {};
 			V.SecExp.buildings.propHub = V.SecExp.buildings.propHub || {};
 			V.SecExp.buildings.propHub.active = V.SecExp.buildings.propHub.active || 0;
+			if (V.SecExp.buildings.pr === null) {
+				delete V.SecExp.buildings.pr;
+			}
 			if (jsDef(V.SecExp.buildings.pr)) {
 				V.SecExp.buildings.propHub = V.SecExp.buildings.pr;
-				V.SecExp.buildings.pr = null;
+				delete V.SecExp.buildings.pr;
 			}
 			if (jsDef(V.propHub)) {
 				V.SecExp.buildings.propHub.active = V.propHub; delete V.propHub;
@@ -869,7 +872,6 @@ App.SecExp.Check = (function() {
 
 			if (V.SecExp.buildings.propHub.active > 0) {
 				V.SecExp.buildings.propHub.recuriterOffice = V.SecExp.buildings.propHub.recuriterOffice || 0;
-		
 				V.SecExp.buildings.propHub.campaign = V.SecExp.buildings.propHub.campaign || 0;
 				if (jsDef(V.propCampaign)) {
 					V.SecExp.buildings.propHub.campaign = V.propCampaign;