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Relates to or clones MC-91044

Still in the 17w49b.

This breaks 19w49b on Ubuntu. Error:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 12/7/17 10:56 AM
Description: Initializing game

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 10 path $
	at com.google.gson.JsonParser.parse(JsonParser.java:65)
	at rk.a(SourceFile:73)
	at rk.a(SourceFile:66)
	at sc.a(SourceFile:35)
	at rx.a(SourceFile:38)
	at rz.a(SourceFile:33)
	at bnc.a(SourceFile:1170)
	at bmz.an(SourceFile:437)
	at bmz.a(SourceFile:365)
	at net.minecraft.client.main.Main.main(SourceFile:140)
Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 10 path $
	at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1559)
	at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1401)
	at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:542)
	at com.google.gson.stream.JsonReader.peek(JsonReader.java:425)
	at com.google.gson.JsonParser.parse(JsonParser.java:60)
	... 9 more


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

-- Head --
Thread: Client thread
Stacktrace:
	at com.google.gson.JsonParser.parse(JsonParser.java:65)
	at rk.a(SourceFile:73)
	at rk.a(SourceFile:66)
	at sc.a(SourceFile:35)
	at rx.a(SourceFile:38)
	at rz.a(SourceFile:33)
	at bnc.a(SourceFile:1170)
	at bmz.an(SourceFile:437)

-- Initialization --
Details:
Stacktrace:
	at bmz.a(SourceFile:365)
	at net.minecraft.client.main.Main.main(SourceFile:140)

-- System Details --
Details:
	Minecraft Version: 17w49b
	Operating System: Linux (amd64) version 4.10.0-40-generic
	Java Version: 1.8.0_151, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 102086928 bytes (97 MB) / 172986368 bytes (164 MB) up to 4281597952 bytes (4083 MB)
	JVM Flags: 4 total; -Xmx4G -XX:+UseConcMarkSweepGC -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 17w49b
	LWJGL: 3.1.2 build 29
	OpenGL: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2)  GL version 3.0 Mesa 17.0.7, Intel Open Source Technology Center
	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/Not Microsoft (incompatible)
	Current Language: ~~ERROR~~ NullPointerException: null
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz

@unknown are you sure that isn't because you have an incompatible resource pack loaded?

I did not use any resource pack, and is still not fixed.

same issue without resourcepack
i think it has to do something with data packs