diff --git a/src/main/java/gregtech/common/metatileentities/multi/multiblockpart/MetaTileEntityMufflerHatch.java b/src/main/java/gregtech/common/metatileentities/multi/multiblockpart/MetaTileEntityMufflerHatch.java
index a3bda35179a..efbe976fccb 100644
--- a/src/main/java/gregtech/common/metatileentities/multi/multiblockpart/MetaTileEntityMufflerHatch.java
+++ b/src/main/java/gregtech/common/metatileentities/multi/multiblockpart/MetaTileEntityMufflerHatch.java
@@ -76,7 +76,7 @@ public void clearMachineInventory(NonNullList<ItemStack> itemBuffer) {
     public void recoverItemsTable(List<ItemStack> recoveryItems) {
         for (ItemStack recoveryItem : recoveryItems) {
             if (calculateChance()) {
-                GTTransferUtils.insertItem(inventory, recoveryItem, false);
+                GTTransferUtils.insertItem(inventory, recoveryItem.copy(), false);
             }
         }
     }