Custom Shulker Recipe

If you have a Shulker recipe and it shows in the recipe book, the game crashes. (Server)

Crash report:

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 06.01.18 18:23
Description: Rendering screen

java.lang.ArithmeticException: / by zero
	at btn$a.c(SourceFile:112)
	at btn.a(SourceFile:72)
	at btp.a(SourceFile:298)
	at bso.a(SourceFile:81)
	at cao.a(SourceFile:997)
	at bnv.b(SourceFile:822)
	at bnv.a(SourceFile:382)
	at net.minecraft.client.main.Main.main(SourceFile:140)


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

-- Head --
Thread: Client thread
Stacktrace:
	at btn$a.c(SourceFile:112)
	at btn.a(SourceFile:72)
	at btp.a(SourceFile:298)
	at bso.a(SourceFile:81)

-- Screen render details --
Details:
	Screen name: bso
	Mouse location: Scaled: (225, 201). Absolute: (450,000000, 403,000000)
	Screen size: Scaled: (683, 384). Absolute: (1366, 768). Scale factor of 2,000000

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [cab['TextComponent{text='Lex305', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/6, l='MpServer', x=60,23, y=22,65, z=143,93]]
	Chunk stats: MultiplayerChunkCache: 441, 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (25,22,116), Chunk: (at 9,1,4 in 1,7; contains blocks 16,0,112 to 31,255,127), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 1180351 game time, 6000 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 12 total; [cab['TextComponent{text='Lex305', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/6, l='MpServer', x=60,23, y=22,65, z=143,93], agx['TranslatableComponent{key='entity.ItemFrame.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/0, l='MpServer', x=-82,97, y=28,50, z=129,50], aez['TranslatableComponent{key='entity.Pig.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/1, l='MpServer', x=75,50, y=21,67, z=95,50], ajw['TranslatableComponent{key='entity.Arrow.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/20, l='MpServer', x=53,39, y=22,01, z=138,64], aaj['TranslatableComponent{key='entity.XPOrb.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/21, l='MpServer', x=41,26, y=17,00, z=124,67], aaj['TranslatableComponent{key='entity.XPOrb.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/22, l='MpServer', x=41,15, y=17,00, z=124,20], agv['TranslatableComponent{key='entity.ArmorStand.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/7, l='MpServer', x=42,79, y=22,00, z=138,50], akg['TranslatableComponent{key='entity.MinecartRideable.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/8, l='MpServer', x=42,79, y=22,00, z=138,50], afi['TranslatableComponent{key='entity.Wolf.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/10, l='MpServer', x=58,57, y=22,00, z=142,19], afi['TranslatableComponent{key='entity.Wolf.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/11, l='MpServer', x=59,34, y=22,00, z=149,30], afi['TranslatableComponent{key='entity.Wolf.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/12, l='MpServer', x=55,34, y=22,00, z=146,74], afi['TranslatableComponent{key='entity.Wolf.name', args=[], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/13, l='MpServer', x=59,51, y=22,00, z=141,69]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at byc.a(SourceFile:357)
	at bnv.b(SourceFile:1833)
	at bnv.a(SourceFile:391)
	at net.minecraft.client.main.Main.main(SourceFile:140)

-- System Details --
Details:
	Minecraft Version: 18w01a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1139783928 bytes (1086 MB) / 3865509888 bytes (3686 MB) up to 3865509888 bytes (3686 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn4G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 18w01a
	LWJGL: 3.1.2 build 29
	OpenGL: Intel(R) HD Graphics 4400 GL version 4.3.0 - Build 20.19.15.4703, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: vanilla, file/Mine Racers (incompatible)
	Current Language: ~~ERROR~~ NullPointerException: null
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i5-4210U CPU @ 1.70GHz