diff --git a/mods/survival.js b/mods/survival.js
index 3cc1949a..b8970545 100644
--- a/mods/survival.js
+++ b/mods/survival.js
@@ -259,6 +259,7 @@ function survivalResetCloner() {
     survivalSave();
 }
 
+worldgentypes = {}
 window.addEventListener("load",function(){
     // move to start of tools
     var erase = document.getElementById("elementButton-erase");
@@ -273,6 +274,7 @@ window.addEventListener("load",function(){
     document.getElementById("elemSelectButton").remove();
     doRandomEvents = function() {}
     worldGen = function() {}
+    worldgentypes = {}
     loadSave = function() {}
     showSaves = function() {}
     placeImage = function() {}