diff --git a/src/blitz/protocol/PacketFactory.cpp b/src/blitz/protocol/PacketFactory.cpp
index 4511316..71f8c7a 100644
--- a/src/blitz/protocol/PacketFactory.cpp
+++ b/src/blitz/protocol/PacketFactory.cpp
@@ -18,6 +18,7 @@ static const std::array<std::unique_ptr<Packet>, static_cast<std::size_t>(Packet
 };
 
 const std::unique_ptr<Packet>& CreateReadOnlyPacket(PacketType a_Type) {
+	assert(a_Type < PacketType::PACKET_COUNT);
 	return Packets[static_cast<std::size_t>(a_Type)];
 }