Created 4 dispensers and put fireworks in each, connected a redstone circuit to each with a lever at the end, attempting to set off the fireworks causes an error to appear on the client side that reads: "Connection Lost: End of Stream", any attempts to reconnect result in an error reading "Connection Lost: Internal exception: java.net.socketException: Connection reset" the server must be reset for anyone to log back in.

EDIT: This error seems to occur even when fireworks are placed on the ground, but less frequent.