diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
index 61622c379..109b6bcd3 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
@@ -2216,6 +2216,8 @@ public class PacketConsumers {
 
     public static final BiConsumer<NetWorkUser, ByteBufPacketEvent> SET_CREATIVE_MODE_SLOT = (user, event) -> {
         try {
+            if (!(user instanceof BukkitServerPlayer serverPlayer)) return;
+            if (!serverPlayer.isCreativeMode()) return;
             FriendlyByteBuf buf = event.getBuffer();
             Object friendlyBuf = FastNMS.INSTANCE.constructor$FriendlyByteBuf(buf);
             short slotNum = buf.readShort();