diff --git a/src/main/java/org/ultramine/server/util/InventoryUtil.java b/src/main/java/org/ultramine/server/util/InventoryUtil.java
index edbeb52..431535f 100644
--- a/src/main/java/org/ultramine/server/util/InventoryUtil.java
+++ b/src/main/java/org/ultramine/server/util/InventoryUtil.java
@@ -94,7 +94,7 @@
 		for(int i = 0, s = inv.getSizeInventory(); i < s; i++)
 		{
 			ItemStack it = inv.getStackInSlot(i);
-			if(it != null)
+			if(it != null && isStacksEquals(it, is))
 			{
 				int amount = it.stackSize;