[MC-101229] Multiple hoppers cause Unexpected error crash caused by NullPointerException

Note

The exact reason why this happens is unknown. This bug cannot be reproduced in 1.9.

The bug

Having many hoppers (not pointing into each other) crashes the game. This crash is caused by a java.lang.NullPointerException (see attached crash report).

How to reproduce

Create a Superflat world with the preset

3;minecraft:hopper:0;1;

1.9.3-pre1

Description: Unexpected error

java.lang.NullPointerException: Unexpected error
	at aht.k(SourceFile:1415)
	at bcc.t(SourceFile:1642)
	at bcc.av(SourceFile:963)
	at bcc.a(SourceFile:393)
	at net.minecraft.client.main.Main.main(SourceFile:124)

Linked issues

relates to 1

MC-101228 Multiple hoppers pointing into each other causes crash for Batching chunks caused by ConcurrentModificationException Resolved

Attachments

crash-2016-04-23_20.33.32-client.txt

Comments 3

[Mod] redstonehelper 2016-04-30T00:32:12Z

Still an issue in 1.9.3-pre2?

Extreme 2016-06-10T21:07:06Z

Also seems to persist in 1.10: http://hopper.minecraft.net/crashes/minecraft/MCX-2812818/#tab_crash-info

Can also confirm that using those presets does crash the game after a brief moment.

wobst.michael 2016-10-30T17:10:20Z

Cannot reproduce in 16w43a.

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w43a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.