diff --git a/src/data/backwardsCompatibility/backwardsCompatibility.js b/src/data/backwardsCompatibility/backwardsCompatibility.js
index 3d5f3383b8bfb1634a313ce83d2699f7c2428ee8..a77b313ad72e05731c4575f1ce3633166118943a 100644
--- a/src/data/backwardsCompatibility/backwardsCompatibility.js
+++ b/src/data/backwardsCompatibility/backwardsCompatibility.js
@@ -1727,6 +1727,10 @@ App.Update.oldVersions = function(node) {
 				androgyny: 0,
 				girlsOnly: 0
 			};
+			if (typeof V.PC.advancedGeneticModifications === "undefined") {
+			V.PC.advancedGeneticModifications = {
+				uterineHypersensitivity: 0
+			};
 			if (V.PC.birthMaster > 0) {
 				V.PC.geneticQuirks.fertility = 2;
 			} else if (V.PC.career === "servant") {