[MC-106099] Firework Rocket does not spawn

Firework Rockets do not spawn (with both command blocks and the item).

[20:42:33] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
	at h.a(SourceFile:46) [16w32b.jar:?]
	at bdo.av(SourceFile:959) [16w32b.jar:?]
	at bdo.a(SourceFile:395) [16w32b.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:124) [16w32b.jar:?]
Caused by: java.lang.NullPointerException
	at aar.<init>(SourceFile:52) ~[16w32b.jar:?]
	at bmc.a(SourceFile:318) ~[16w32b.jar:?]
	at fp.a(SourceFile:122) ~[16w32b.jar:?]
	at fp.a(SourceFile:13) ~[16w32b.jar:?]
	at fn$1.run(SourceFile:13) ~[16w32b.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
	at h.a(SourceFile:45) ~[16w32b.jar:?]
	... 3 more