[MC-123645] 17w49a+ crash: Initializing game / java.lang.IllegalStateException: Not a JSON Object: null

The bug

Minecraft crashes when launching snapshot versions 17w49a/b and 17w50a. I have already seen MC-121738 , which says that disabling custom resolution would fix the problem. This didn't work for me, however.
To clarify, all versions and snapshots prior to 17w49a work perfectly fine, even 17w48a works perfectly.

Crash report

17w50a: crash-2017-12-28_17.59.14-client.txt

Description: Initializing game

java.lang.IllegalStateException: Not a JSON Object: null
	at com.google.gson.JsonElement.getAsJsonObject(JsonElement.java:90)
	at rl.a(SourceFile:73)
	at rl.a(SourceFile:66)
	at sd.a(SourceFile:35)
	at ry.a(SourceFile:38)
	at sa.a(SourceFile:33)
	at bnh.a(SourceFile:1170)
	at bne.an(SourceFile:437)
	at bne.a(SourceFile:365)
	at net.minecraft.client.main.Main.main(SourceFile:140)

Related issues

is duplicated by

MC-8991 Gap between textures.

MC-128559 Minecraft Aquatic Update 18w15a Snapshot Crash

MC-128601 I get this crash after I copied 18w15a jar to make a resourcepack.

MC-134038 Game crashes when opening resource pack menu, then can't launch again

MC-134061 Minecraft Crashes on launch

MCL-8991 Error When Loading Game.

relates to

MC-133098 Loading a world with a corrupted stats file crashes the game

MC-134872 Game crashes after loading world 100%

Attachments

crash-2017-12-28_17.59.14-client.txt

Comments

migrated 2017-12-28T17:15:23Z

[media]

migrated 2017-12-28T17:15:57Z

Affected versions also include Minecraft 17w49a/b

[Mod] Neko 2017-12-28T23:47:15Z

Does disabling your resource pack fix the issue?

migrated 2017-12-29T17:02:17Z

Sorry for the late response. No, unfortunately, it doesn't. When launching I made sure that I had no resource packs on. Do you know of any another solution that might help? Thanks

migrated 2018-07-18T22:44:10Z

I have a similar problem, but my game can't launch 1.13 again. Additionally, unlike some of the duplicates, the problem was started when I opened the resource pack menu, without actually loading any resource pack. [I put this here in case it helps in fixing the issue at all. If a mod wants me to take this comment down, I will.]

migrated 2018-07-19T19:45:20Z

Hello all,

I have managed to find a fix for this (that has worked for me at least):

Simply go to your .../AppData/Roaming folder, and rename your .minecraft folder to something else. Then, open minecraft client, login, and download 1.13. This should create a brand new .minecraft folder. Once that's done, move your saves file from the original .minecraft folder into the new one that is created. Now, you should no longer get the error, and you have all your saves! (you may remove the old .minecraft folder if you wish)

tl;dr: Get a fresh install of Minecraft through removing the .minecraft folder and letting the mc client create a new .minecraft folder.

Thanks, Pie

migrated 2018-07-20T16:19:13Z

This fix worked for me! Thank you so much!

migrated 2018-07-24T02:54:01Z

Player from the Linux version here. Tried this fix, among others, and it doesn't work for me.

violine1101 2018-08-08T13:46:38Z

I marked MC-133098 as related to this issue. MC-133098 is a server crash, this is a client crash, but they're essentially the same core issue.

violine1101 2018-08-15T16:15:47Z

Please check if this issue is still happening in 18w33a.

wobst.michael 2018-10-06T12:02:10Z

Is this still an issue in Minecraft 1.13.1?