diff --git a/src/main/java/com/volmit/iris/engine/modifier/IrisCarveModifier.java b/src/main/java/com/volmit/iris/engine/modifier/IrisCarveModifier.java
index d711512ab..b03dac036 100644
--- a/src/main/java/com/volmit/iris/engine/modifier/IrisCarveModifier.java
+++ b/src/main/java/com/volmit/iris/engine/modifier/IrisCarveModifier.java
@@ -237,24 +237,27 @@ public class IrisCarveModifier extends EngineAssignedModifier<BlockData> {
 
         blocks = biome.generateCeilingLayers(getDimension(), xx, zz, rng, 3, zone.ceiling, getData(), getComplex());
 
-        for (int i = 0; i < zone.ceiling + 1; i++) {
-            if (!blocks.hasIndex(i)) {
-                break;
+        if(zone.ceiling + 1 < mantle.getWorldHeight())
+        {
+            for (int i = 0; i < zone.ceiling + 1; i++) {
+                if (!blocks.hasIndex(i)) {
+                    break;
+                }
+
+                BlockData b = blocks.get(i);
+                BlockData up = output.get(rx, zone.ceiling + i + 1, rz);
+
+                if (!B.isSolid(up)) {
+                    continue;
+                }
+
+                if (B.isOre(up)) {
+                    output.set(rx, zone.ceiling + i + 1, rz, B.toDeepSlateOre(up, b));
+                    continue;
+                }
+
+                output.set(rx, zone.ceiling + i + 1, rz, b);
             }
-
-            BlockData b = blocks.get(i);
-            BlockData up = output.get(rx, zone.ceiling + i + 1, rz);
-
-            if (!B.isSolid(up)) {
-                continue;
-            }
-
-            if (B.isOre(up)) {
-                output.set(rx, zone.ceiling + i + 1, rz, B.toDeepSlateOre(up, b));
-                continue;
-            }
-
-            output.set(rx, zone.ceiling + i + 1, rz, b);
         }
     }
 
diff --git a/src/main/java/com/volmit/iris/util/nbt/mca/Chunk.java b/src/main/java/com/volmit/iris/util/nbt/mca/Chunk.java
index 801c95345..c2a3adc11 100644
--- a/src/main/java/com/volmit/iris/util/nbt/mca/Chunk.java
+++ b/src/main/java/com/volmit/iris/util/nbt/mca/Chunk.java
@@ -253,7 +253,14 @@ public class Chunk {
     }
 
     public CompoundTag getBlockStateAt(int blockX, int blockY, int blockZ) {
-        Section section = sections.get(MCAUtil.blockToChunk(blockY));
+        int s = MCAUtil.blockToChunk(blockY);
+
+        if(sections.length() <= s)
+        {
+            return null;
+        }
+
+        Section section = sections.get(s);
         if (section == null) {
             return null;
         }
@@ -274,6 +281,12 @@ public class Chunk {
      */
     public void setBlockStateAt(int blockX, int blockY, int blockZ, CompoundTag state, boolean cleanup) {
         int sectionIndex = MCAUtil.blockToChunk(blockY);
+
+        if(sections.length() <= sectionIndex)
+        {
+            return;
+        }
+
         Section section = sections.get(sectionIndex);
         if (section == null) {
             section = Section.newSection();