diff --git a/pom.xml b/pom.xml
index 1b29260..59d6bc5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -374,8 +374,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>17</source>
+                    <target>17</target>
                 </configuration>
             </plugin>
             <plugin>
diff --git a/src/main/java/com/Acrobot/Breeze/Utils/InventoryUtil.java b/src/main/java/com/Acrobot/Breeze/Utils/InventoryUtil.java
index 113e718..9ff57be 100644
--- a/src/main/java/com/Acrobot/Breeze/Utils/InventoryUtil.java
+++ b/src/main/java/com/Acrobot/Breeze/Utils/InventoryUtil.java
@@ -41,10 +41,6 @@ public class InventoryUtil {
             return 0;
         }
 
-        if (inventory.getType() == null) {
-            return Integer.MAX_VALUE;
-        }
-
         HashMap<Integer, ? extends ItemStack> items = inventory.all(item.getType());
         int itemAmount = 0;
 
diff --git a/src/main/java/com/Acrobot/ChestShop/Listeners/Item/ItemMoveListener.java b/src/main/java/com/Acrobot/ChestShop/Listeners/Item/ItemMoveListener.java
index 5e50261..e1dc418 100644
--- a/src/main/java/com/Acrobot/ChestShop/Listeners/Item/ItemMoveListener.java
+++ b/src/main/java/com/Acrobot/ChestShop/Listeners/Item/ItemMoveListener.java
@@ -1,11 +1,20 @@
 package com.Acrobot.ChestShop.Listeners.Item;
 
+import com.Acrobot.ChestShop.Listeners.Modules.StockCounterModule;
 import com.Acrobot.ChestShop.Signs.ChestShopSign;
+import com.Acrobot.ChestShop.Utils.ItemUtil;
+import com.Acrobot.ChestShop.Utils.uBlock;
+import org.bukkit.Bukkit;
+import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
+import org.bukkit.block.Hopper;
+import org.bukkit.block.Sign;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.inventory.InventoryMoveItemEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
 
 import static com.Acrobot.Breeze.Utils.ImplementationAdapter.getHolder;
 
@@ -16,14 +25,25 @@ public class ItemMoveListener implements Listener {
 
     @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
     public static void onItemMove(InventoryMoveItemEvent event) {
-        if (event.getSource() == null || getHolder(event.getDestination(), false) instanceof BlockState) {
-            return;
-        }
+        InventoryHolder destinationHolder = getHolder(event.getDestination(), false);
+        InventoryHolder sourceHolder = getHolder(event.getSource(), false);
 
-        if (!ChestShopSign.isShopBlock(getHolder(event.getSource(), false))) {
-            return;
-        }
+        if (!(destinationHolder instanceof BlockState) && ChestShopSign.isShopBlock(sourceHolder)) {
+            event.setCancelled(true);
+        } else if (ChestShopSign.isShopBlock(destinationHolder) && sourceHolder instanceof Hopper) {
+            Block shopBlock = ChestShopSign.getShopBlock(destinationHolder);
+            Sign connectedSign = uBlock.getConnectedSign(shopBlock);
 
-        event.setCancelled(true);
+            Inventory tempInv = Bukkit.createInventory(null, destinationHolder.getInventory().getSize() + 9);
+            tempInv.setContents(ItemUtil.deepClone(destinationHolder.getInventory().getContents()));
+            tempInv.addItem(event.getItem().clone());
+
+            StockCounterModule.updateCounterOnQuantityLine(connectedSign, tempInv);
+
+            tempInv.clear();
+            tempInv.close();
+        }
     }
+
+
 }
diff --git a/src/main/java/com/Acrobot/ChestShop/Signs/ChestShopSign.java b/src/main/java/com/Acrobot/ChestShop/Signs/ChestShopSign.java
index 31a24de..1819cec 100644
--- a/src/main/java/com/Acrobot/ChestShop/Signs/ChestShopSign.java
+++ b/src/main/java/com/Acrobot/ChestShop/Signs/ChestShopSign.java
@@ -21,6 +21,7 @@ import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.InventoryHolder;
 
 import java.util.Locale;
+import java.util.Optional;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -109,25 +110,35 @@ public class ChestShopSign {
             return false;
         }
 
-        if (holder instanceof DoubleChest) {
-            return isShopChest(((DoubleChest) holder).getLocation().getBlock());
-        } else if (holder instanceof Chest) {
-            return isShopChest(((Chest) holder).getBlock());
+        if (holder instanceof DoubleChest dChest) {
+            return isShopChest(dChest.getLocation().getBlock());
+        } else if (holder instanceof Chest chest) {
+            return isShopChest(chest.getBlock());
         } else {
             return false;
         }
     }
 
     public static boolean isShopBlock(InventoryHolder holder) {
-        if (holder instanceof DoubleChest) {
-            return isShopBlock(((DoubleChest) holder).getLeftSide())
-                    || isShopBlock(((DoubleChest) holder).getRightSide());
-        } else if (holder instanceof BlockState) {
-            return isShopBlock(((BlockState) holder).getBlock());
+        if (holder instanceof DoubleChest dChest) {
+            return isShopBlock(dChest.getLeftSide())
+                    || isShopBlock(dChest.getRightSide());
+        } else if (holder instanceof BlockState blockState) {
+            return isShopBlock(blockState.getBlock());
         }
         return false;
     }
 
+    public static Block getShopBlock(InventoryHolder holder) {
+        if (holder instanceof DoubleChest dChest) {
+            return Optional.ofNullable(getShopBlock(dChest.getLeftSide()))
+                    .orElse(getShopBlock(dChest.getRightSide()));
+        } else if (holder instanceof BlockState state) {
+            return state.getBlock();
+        }
+        return null;
+    }
+
     public static boolean canAccess(Player player, Sign sign) {
         return hasPermission(player, Permission.OTHER_NAME_ACCESS, sign);
     }
diff --git a/src/main/java/com/Acrobot/ChestShop/Utils/ItemUtil.java b/src/main/java/com/Acrobot/ChestShop/Utils/ItemUtil.java
index e139490..31a1112 100644
--- a/src/main/java/com/Acrobot/ChestShop/Utils/ItemUtil.java
+++ b/src/main/java/com/Acrobot/ChestShop/Utils/ItemUtil.java
@@ -96,4 +96,12 @@ public class ItemUtil {
     public static String getSignName(ItemStack itemStack) {
         return getName(itemStack, MAXIMUM_SIGN_WIDTH);
     }
+
+    public static ItemStack[] deepClone(ItemStack[] toClone) {
+        ItemStack[] cloned = toClone.clone();
+        for (int i = 0; i < toClone.length; i++) {
+            cloned[i] = toClone[i].clone();
+        }
+        return cloned;
+    }
 }