diff --git a/src/main/java/goodgenerator/blocks/tileEntity/LargeEssentiaSmeltery.java b/src/main/java/goodgenerator/blocks/tileEntity/LargeEssentiaSmeltery.java
index cfb2d0af..00e1538c 100644
--- a/src/main/java/goodgenerator/blocks/tileEntity/LargeEssentiaSmeltery.java
+++ b/src/main/java/goodgenerator/blocks/tileEntity/LargeEssentiaSmeltery.java
@@ -336,7 +336,8 @@ private AspectList getEssentia(ItemStack itemStack, int amount) {
 
     private void fillEssentiaOutputHatch() {
         for (EssentiaOutputHatch outputHatch : this.mEssentiaOutputHatches) {
-            for (Map.Entry<Aspect, Integer> entry : this.mOutputAspects.aspects.entrySet()) {
+            for (Map.Entry<Aspect, Integer> entry :
+                    this.mOutputAspects.copy().aspects.entrySet()) {
                 Aspect aspect = entry.getKey();
                 int amount = entry.getValue();
                 this.mOutputAspects.remove(aspect, outputHatch.addEssentia(aspect, amount, null));