Your problem is already fixed probably, but for the people who are searching for a fix, follow my steps

  1. Search for CMD and run it as administrator
  2. Type in the bar: netsh winsock reset
  3. It should be fixed!
  4. If it still doesn't work, try contacting Mojang, the creators of Minecraft
Answer from PixelTubeYT on Stack Exchange
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Reddit
reddit.com › r/minecraft › java.lang.nullpointerexception: group
r/Minecraft on Reddit: java.lang.nullpointerexception: group
October 29, 2018 -

My husband is having trouble connecting to my server when i try to open to Lan. It was working yesterday and now after turning both mine and his pc’s off for the night he cant connect.
He keeps getting this error:
java.lang.nullpointerexception: group
Sometimes on my screen i can see that he has joined the game, then a second later it reads that he has left the game. On his screen it just says "Failed to connect to the server disconnected”
Hope someone can help :)

Discussions

Modded Server Error: java.lang.NullPointerException: Unexpected error - Java Edition Support - Support - Minecraft Forum - Minecraft Forum
I was playing a modded server, tried to use a spell from Ars Magica 2, and got kicked. Every time I join the launcher crashes and it gives the same error mes... More on minecraftforum.net
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Error Java . Lang . NullPointerException Please help me
Hi, I have encountered a problem... Yesterday I was playing absolutely fine with minecraft forge, and then today for some reason, I cant login to hypixel, and it comes up with this (see image Below) I tried reinstalling java, minecraft and forge, yet still the problem persists. I tried running... More on hypixel.net
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4
0
July 20, 2017
java.lang.NullPointerException: Unexpected error
Ok so im using the Origins adventure modpack and my friend can join the server but somehow i cant. it goes through all the normal processes until it gets to joining world at which point it just crashes and gives me the error. any ideas as to whats doing… More on board.aternos.org
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7
January 7, 2022
Server Error java.lang.NullPointerException: null Help - Server Support and Administration - Support - Minecraft Forum - Minecraft Forum
I recently trying playing on this server with my sister but I tried to open the server once and I had a blue screen. Once my computer turned on again there w... More on minecraftforum.net
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December 27, 2020
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Forge Forums
forums.minecraftforge.net › home › minecraft forge › support & bug reports › cant get into my server due to java.lang.nullpointerexception [1.19.2]
Cant get into my server due to java.lang.NullPointerException [1.19.2] - Support & Bug Reports - Forge Forums
March 23, 2023 - I can load into the minecraft launcher and game just fine, but as soon as i load into my world i get to the "building terrain" bit, then instant " The game crashed: exception in server tick loop Error: java.lang.NoClassDefFoundError: net/minecraft/entity/Entity$2 "
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Minecraft Forum
minecraftforum.net › home › minecraft forum › support › java edition support › modded server error: java.lang.nullpointerexception: unexpected error
Modded Server Error: java.lang.NullPointerException: Unexpected error - Java Edition Support - Support - Minecraft Forum - Minecraft Forum
Minecraft: Dweller_Benthos · Member Details · It's still an Adventure Backpack problem, something about rendering the overlay for the experience bar. I would say try to see if the author of Adventure Backpack has a github or a place to report problems, and ask them if the issue is with their mod or some kind of interaction with other mods.
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Hypixel Forums
hypixel.net › home › forums › hypixel server › community help forum
Error Java . Lang . NullPointerException Please help me | Hypixel Forums
July 20, 2017 - Hi, I have encountered a problem... Yesterday I was playing absolutely fine with minecraft forge, and then today for some reason, I cant login to hypixel, and it comes up with this (see image Below) I tried reinstalling java, minecraft and forge, yet still the problem persists. I tried running...
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Fossils and Archeology Mod Revival Wiki
fossils-archeology.fandom.com › f › p › 3320054632415559970 › r › 3587255587307848309
I keep getting the "Error: java.lang.NullPointerException: Initializing game" and i cannot fix it | Fandom
</p><p> </p><p> I'm currently have Fossils_Archeology_Revival-1.7.10_Build-7.3 and llibrary-1.7.14-1.12.2 and used forge-1.7.10-10.13.4.1558-1.7.10-installer-win I have Java version 8 update 181 (build 1.8.0_181-b13), the crash I keep getting is: Error: java.lang.NullPointerException: Initializing game and it will not let me view the crash report. </p><p> </p><p> I'm not the best with this stuff so If anyone can help me I would be very greatful! ;-; </p> (Edited by A Fandom user) 0 · Mushroomsock·7/18/2018 · <p>Your llibrary is the wrong version. You're using llibrary-1.7.14-1.12.2, which is for Minecraft 1.12, not 1.7.10 (which this mod is for.)
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Aternos Community
board.aternos.org › thread › 85052-java-lang-nullpointerexception-unexpected-error
java.lang.NullPointerException: Unexpected error - Server - Aternos Community
January 7, 2022 - Try deleting the config folder which is located in the minecraft installation path (enter %appdata%/.minecraft in the file explorer ) and if it doesn't work then try deleting aether mod
Find elsewhere
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Stealthy Gaming
stealthygaming.com › home › minecraft › fix: minecraft java.lang.nullpointerexception group error
Fix: Minecraft java.lang.nullpointerexception group error - Stealthy Gaming
October 3, 2022 - Short Answer: The Minecraft null pointer exception error may be caused due to a faulty server, an outdated version of Java, a firewall or an antivirus interfering with the connection, or errors during a game or Java setup.
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Minecraft Forum
minecraftforum.net › home › minecraft forum › support › server support and administration › server error java.lang.nullpointerexception: null help
Server Error java.lang.NullPointerException: null Help - Server Support and Administration - Support - Minecraft Forum - Minecraft Forum
December 27, 2020 - java.lang.NullPointerException: null at net.minecraft.server.MinecraftServer.a(SourceFile:569) ~[server.jar:?] at net.minecraft.server.MinecraftServer.t(SourceFile:596) ~[server.jar:?] at zg.t(SourceFile:558) ~[server.jar:?] at net.minecraft.server.MinecraftServer.w(SourceFile:704) ~[server.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:254) ~[server.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_261] Rollback Post to Revision RollBack ·
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GitHub
github.com › CaffeineMC › sodium › issues › 1254
The game crashed whilst unexpected error Error: java.lang.NullPointerException: Cannot read field "field_3911" because "this.field_4015.field_1724" is null Exit Code: -1 · Issue #1254 · CaffeineMC/sodium
March 2, 2022 - The game crashed whilst unexpected error Error: java.lang.NullPointerException: Cannot read field "field_3911" because "this.field_4015.field_1724" is null Exit Code: -1#1254
Published   Apr 01, 2022
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Forge Forums
forums.minecraftforge.net › minecraft forge › support & bug reports
java.lang.NullPointerException: Unexpected error Minecraft crash - Support & Bug Reports - Forge Forums
March 19, 2023 - Tryna make a modpack but when i press play minecraft will start to load then just crash saying --- Minecraft Crash Report ---- WARNING: coremods are present: XaeroWorldMapPlugin (XaerosWorldMap_1.29.3_Forge_1.12.jar) SpartanWeaponry-MixinLoader (SpartanWeaponry-1.12.2-1.5.1.jar) Contact their aut...
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Mojira
bugs.mojang.com › browse › MC-249702
Server crash: java.lang.NullPointerException: Cannot invoke ...
March 30, 2022 - Terms of Use | Privacy Statement | Consumer Health Privacy
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Planet Minecraft
planetminecraft.com › forums › help › javaedition › internal exception: java.lang.nullpointerexception
Internal Exception: java.lang.NullPointerException
November 10, 2014 - So now I'm trying to play multiplayer and I keep getting "Internal Exception: java.lang.NullPointerException" on trying to join servers. I put in the server name and IP, then save that to the list. I go back to list, select, and click "Join Server" .... It says "connecting to network" "logging in ..." and then our error pops up and I can't wiggle past it. Apparently there's another error involving the NullPointerException, but I haven't been able to find a fix that works for THIS one.
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DigitalOcean
digitalocean.com › community › tutorials › java-lang-nullpointerexception
Java NullPointerException - Detect, Fix, and Best Practices | DigitalOcean
August 3, 2022 - Then look at the code and see what could be null causing the NullPointerException. Just look at all the above examples, it’s very clear from stack trace what is causing null pointer exception. java.lang.NullPointerException is an unchecked exception, so we don’t have to catch it.
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Mojira
bugs.mojang.com › browse › MC-250312
Game crashing when clicking singleplayer || java.lang. ...
April 20, 2022 - Terms of Use | Privacy Statement | Consumer Health Privacy
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Forge Forums
forums.minecraftforge.net › home › minecraft forge › support & bug reports › the game crashed whilst unexpected error error: java.lang.nullpointerexception: unexpected error exit code: -1
The game crashed whilst unexpected error Error: java.lang.NullPointerException: Unexpected error Exit Code: -1 - Support & Bug Reports - Forge Forums
May 19, 2021 - I was trying to join my friend's modded server, and it would let me in the server for a second and then crash with this message: I downloaded a copy of the mods of someone who could play in the server. here is the debug log: [18May2021 20:00:19.310] [main/INFO] [cpw.mods.modlauncher.Launcher/MODL...
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Forge Forums
forums.minecraftforge.net › minecraft forge › support & bug reports
Better Minecraft 1.16.5 java.lang.NullPointerException: Loading entity NBT - Support & Bug Reports - Forge Forums
July 5, 2022 - Java checker returned some invalid data we don't understand: Check the Azul Zulu site and select your OS and download the latest Java 8 build for Linux https://www.azul.com/downloads/?version=java-8-lts&package=jre#zulu After installation, check the path and put this path into your Launcher Java settings (Java Executable) Server Crash 1.20.1 - Crash upon world initialization ... Some Create addons are only compatible with Create 6 or Create 5 - so not both versions at the same time Try older builds of Create Stuff and Additions This is the last build before the Create 6 update: https://www.curseforge.com/minecraft/mc-mods/create-stuff-additions/files/6168370
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Mojira
bugs.mojang.com › browse › MC-173067
[MC-173067] NullPointerException when a structure ... - Bugs
February 24, 2020 - Resolved A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed · Install the attached datapack, which adds some campfires to the "minecraft:shipwreck/with_mast" structure. Don't forget to /reload · Search for shipwrecks.
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Minecraft Forum
minecraftforum.net › home › minecraft forum › support › java edition support › java.lang.nullpointerexception, need fix please help
java.lang.NullPointerException, need fix please help - Java Edition Support - Support - Minecraft Forum - Minecraft Forum
I'm excited to get Aether and SCP ... this nullpointerexception problem from installing and attempting to run weeping angels. I guess I could have researched this or read forums or threads but I figured I have different mods than most people so I posted the crash report. ... i have a problem too. --- BEGIN ERROR REPORT ddbbbd5 -------- Generated 12/7/12 4:32 PM Minecraft: Minecraft 1.2.5 OS: Windows 7 (amd64) version 6.1 Java: 1.7.0, Oracle ...
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Mojira
bugs.mojang.com › browse › MC-113337
java.lang.NullPointerException when trying to join servers
February 10, 2017 - It may have been deleted or you don't have permission to view it