Game crash when opening Furnace

Every time I open a Furnace, the game automatically crashes. I am using my own custom data pack, which only adds new recipes, so I thought that might have something to do with it but I'm not sure.

18w30b\: [^crash-2018-07-29_14.57.25-server.txt]

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 7/29/18 2:57 PM
Description: Ticking player

java.lang.NullPointerException: Ticking player
	at bjo.a(SourceFile:416)
	at aqf.a(SourceFile:124)
	at te.R_(SourceFile:327)
	at axv.a(SourceFile:1202)
	at tc.a(SourceFile:577)
	at axv.g(SourceFile:1177)
	at tc.o_(SourceFile:516)
	at axv.l(SourceFile:1067)
	at tc.l(SourceFile:493)
	at net.minecraft.server.MinecraftServer.b(SourceFile:736)
	at net.minecraft.server.MinecraftServer.a(SourceFile:661)
	at dga.a(SourceFile:159)
	at net.minecraft.server.MinecraftServer.run(SourceFile:564)
	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 bjo.a(SourceFile:416)
	at aqf.a(SourceFile:124)
	at te.R_(SourceFile:327)
	at axv.a(SourceFile:1202)
	at tc.a(SourceFile:577)
	at axv.g(SourceFile:1177)

-- Player being ticked --
Details:
	Entity Type: minecraft:player (te)
	Entity ID: 0
	Entity Name: Trailblazer101
	Entity's Exact location: -265.98, 63.00, -229.98
	Entity's Block location: World: (-266,63,-230), Chunk: (at 6,3,10 in -17,-15; contains blocks -272,0,-240 to -257,255,-225), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at tc.o_(SourceFile:516)
	at axv.l(SourceFile:1067)
	at tc.l(SourceFile:493)

-- Affected level --
Details:
	Level name: 1.13 World
	All players: 1 total; [te['Trailblazer101'/0, l='1.13 World', x=-265.98, y=63.00, z=-229.98]]
	Chunk stats: ServerChunkCache: 256 Drop: 0
	Level seed: -1481995395
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-256,63,-210), Chunk: (at 0,3,14 in -16,-14; contains blocks -256,0,-224 to -241,255,-209), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 1483485 game time, 1000 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:736)
	at net.minecraft.server.MinecraftServer.a(SourceFile:661)
	at dga.a(SourceFile:159)
	at net.minecraft.server.MinecraftServer.run(SourceFile:564)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 18w30b
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 337511056 bytes (321 MB) / 838860800 bytes (800 MB) up to 1073741824 bytes (1024 MB)
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [te['Trailblazer101'/0, l='1.13 World', x=-265.98, y=63.00, z=-229.98]]
	Data Packs: vanilla, file/ImprovedMC
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

MCX-3951976