diff --git a/src/main/java/com/volmit/iris/util/mantle/Mantle.java b/src/main/java/com/volmit/iris/util/mantle/Mantle.java
index 06a8a8e4c..e17ae0b32 100644
--- a/src/main/java/com/volmit/iris/util/mantle/Mantle.java
+++ b/src/main/java/com/volmit/iris/util/mantle/Mantle.java
@@ -147,7 +147,7 @@ public class Mantle {
             throw new RuntimeException("The Mantle is closed");
         }
 
-        if (y < 0) {
+        if (y < 0 || y >= worldHeight) {
             return;
         }