diff --git a/src/main/java/electroblob/wizardry/WizardryWorldGenerator.java b/src/main/java/electroblob/wizardry/WizardryWorldGenerator.java
index 0e6bed3e..4283a41e 100644
--- a/src/main/java/electroblob/wizardry/WizardryWorldGenerator.java
+++ b/src/main/java/electroblob/wizardry/WizardryWorldGenerator.java
@@ -237,7 +237,8 @@ public class WizardryWorldGenerator implements IWorldGenerator {
 				// BlockPos is immutable, so I'm not sure if simply saying pos1 = pos will be sufficient.
 				BlockPos layerCentre = new BlockPos(origin);
 
-				while(flag){
+				// Stop when the bottom of the world is reached
+				while(flag && layerCentre.getY() > 0){
 
 					flag = false;