diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/BukkitNetworkManager.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/BukkitNetworkManager.java
index 99cf38b5f..4d7761189 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/BukkitNetworkManager.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/BukkitNetworkManager.java
@@ -3044,10 +3044,11 @@ public class BukkitNetworkManager implements NetworkManager, Listener, PluginMes
         @Override
         public void onPacketSend(NetWorkUser user, ByteBufPacketEvent event) {
             if (Config.disableItemOperations()) return;
+            BukkitServerPlayer player = (BukkitServerPlayer) user;
+            if (!player.isOnline()) return;
             MutableBoolean changed = new MutableBoolean(false);
             FriendlyByteBuf buf = event.getBuffer();
             BukkitItemManager itemManager = BukkitItemManager.instance();
-            BukkitServerPlayer player = (BukkitServerPlayer) user;
             Object friendlyBuf = FastNMS.INSTANCE.constructor$FriendlyByteBuf(buf.source());
             List<RecipeBookEntry<ItemStack>> entries = buf.readCollection(ArrayList::new, byteBuf -> {
                 RecipeBookEntry<ItemStack> entry = RecipeBookEntry.read(byteBuf, __ -> itemManager.wrap(FastNMS.INSTANCE.method$FriendlyByteBuf$readItem(friendlyBuf)));