diff --git a/src/main/java/net/minecraft/server/NetServerHandler.java b/src/main/java/net/minecraft/server/NetServerHandler.java
index 494a702820..2b88c7e94f 100644
--- a/src/main/java/net/minecraft/server/NetServerHandler.java
+++ b/src/main/java/net/minecraft/server/NetServerHandler.java
@@ -830,6 +830,7 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
             this.player.inventory.itemInHandIndex = packet16blockitemswitch.itemInHandIndex;
         } else {
             logger.warning(this.player.name + " tried to set an invalid carried item");
+            this.disconnect("Nope!"); // CraftBukkit
         }
     }