diff --git a/protocol/src/main/java/mc/protocol/io/codec/ProtocolEncoder.java b/protocol/src/main/java/mc/protocol/io/codec/ProtocolEncoder.java
index 146605a..25d0ed4 100644
--- a/protocol/src/main/java/mc/protocol/io/codec/ProtocolEncoder.java
+++ b/protocol/src/main/java/mc/protocol/io/codec/ProtocolEncoder.java
@@ -10,15 +10,17 @@ import mc.protocol.State;
 import mc.protocol.io.NetByteBuf;
 import mc.protocol.packets.ServerSidePacket;
 
-import java.util.Objects;
-
 @Slf4j
 public class ProtocolEncoder extends MessageToByteEncoder<ServerSidePacket> {
 
 	@Override
 	protected void encode(ChannelHandlerContext ctx, ServerSidePacket packet, ByteBuf out) {
 		State state = ctx.channel().attr(NetworkAttributes.STATE).get();
-		int packetId = Objects.requireNonNull(state.getServerSidePacketId(packet.getClass()));
+		Integer packetId = state.getServerSidePacketId(packet.getClass());
+		if (packetId == null) {
+			log.error("Unknown send packet: State {} ; Class {}", state, packet.getClass());
+			return;
+		}
 
 		log.debug("OUT: {}:{}", state, packet);