Fireworks on multiplayer

When launching a Firework Rocket (Item ID:401) without a Firework Star, all guest clients will receive the message:

Connection Lost
End of stream

Steps to reproduce:
1) Start SMP server or open LAN SSP server
2) Have client join server
3) Craft a Firework Rocket using 1 Paper (Item ID:339) and 1 Gunpowder (Item ID:289)
4) Place Firework Rocket on ground

Result:
All guest players (SMP and LAN SSP) within 64 blocks of where the Firework Rocket was placed will be disconnected.