diff --git a/src/main/java/xyz/soukup/ecoCraftCore/commands/ShopCommand.java b/src/main/java/xyz/soukup/ecoCraftCore/commands/ShopCommand.java
index a7558a1..9a73cd3 100644
--- a/src/main/java/xyz/soukup/ecoCraftCore/commands/ShopCommand.java
+++ b/src/main/java/xyz/soukup/ecoCraftCore/commands/ShopCommand.java
@@ -75,6 +75,11 @@ public class ShopCommand {
             return 0;
         }
 
+        if (PDC.getInteger(sign, "shop") != null){
+            player.sendPlainMessage("tato cedule již je obchod");
+            return 0;
+        }
+
 
         VirtualChest virtualChest = VirtualChest.getOrCreate(chest);
         virtualChest.save();
diff --git a/src/main/java/xyz/soukup/ecoCraftCore/events/VirtualChestLogic.java b/src/main/java/xyz/soukup/ecoCraftCore/events/VirtualChestLogic.java
new file mode 100644
index 0000000..33c6671
--- /dev/null
+++ b/src/main/java/xyz/soukup/ecoCraftCore/events/VirtualChestLogic.java
@@ -0,0 +1,4 @@
+package xyz.soukup.ecoCraftCore.events;
+
+public class VirtualChestLogic {
+}