Crash when a conduit is activated

The bug

When activating a conduit block, the game will crash due to NPE: Ticking block entity. The world will keep crashing as long as the conduit is activated.

19w12a\: [^crash-2019-03-20_14.12.18-server.txt]

Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
	at ev.<init>(SourceFile:52)
	at bso.i(SourceFile:194)
	at bso.g(SourceFile:104)
	at bgf.K(SourceFile:620)
	at vd.a(SourceFile:401)
	at net.minecraft.server.MinecraftServer.b(SourceFile:816)
	at net.minecraft.server.MinecraftServer.a(SourceFile:755)
	at dwc.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:630)
	at java.lang.Thread.run(Thread.java:745)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server thread
Stacktrace:
	at ev.<init>(SourceFile:52)
	at bso.i(SourceFile:194)
	at bso.g(SourceFile:104)

-- Block entity being ticked --
Details:
	Name: minecraft:conduit // bso
	Block: Block{minecraft:conduit}[waterlogged=true]
	Block location: World: (-18,52,-166), Chunk: (at 14,3,10 in -2,-11; contains blocks -32,0,-176 to -17,255,-161), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Block: Block{minecraft:conduit}[waterlogged=true]
	Block location: World: (-18,52,-166), Chunk: (at 14,3,10 in -2,-11; contains blocks -32,0,-176 to -17,255,-161), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Stacktrace:
	at bgf.K(SourceFile:620)
	at vd.a(SourceFile:401)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [ve['Asteraoth'/76, l='New World', x=-14.41, y=53.11, z=-162.04]]
	Chunk stats: ServerChunkCache: 2289
	Level seed: 8537701225893321328
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-16,77,-64), Chunk: (at 0,4,0 in -1,-4; contains blocks -16,0,-64 to -1,255,-49), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 1360 game time, 1360 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 63137 (now: false), thunder time: 155352 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:816)
	at net.minecraft.server.MinecraftServer.a(SourceFile:755)
	at dwc.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:630)
	at java.lang.Thread.run(Thread.java:745)