Hello, my game crashes every time I try to get in a singleplayer/multiplayer world.

 

The game crashed whilst exception in server tick loop
Error: java.lang.NullPointerException: Exception in server tick loop
Exit-Code: -1

 

Does anybody know, what I can do?

I hope this is what you mean

 

 

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Don't do that.

Time: 14.03.21 11:11
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
    at net.minecraft.nbt.NBTTagCompound.func_152449_a(NBTTagCompound.java:414)
    at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:47)
    at net.minecraft.nbt.NBTTagCompound.func_152449_a(NBTTagCompound.java:414)
    at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:47)
    at net.minecraft.nbt.NBTTagCompound.func_152449_a(NBTTagCompound.java:414)
    at net.minecraft.nbt.NBTTagCompound.func_152446_a(NBTTagCompound.java:47)
    at net.minecraft.nbt.CompressedStreamTools.func_152455_a(CompressedStreamTools.java:132)
    at net.minecraft.nbt.CompressedStreamTools.func_152456_a(CompressedStreamTools.java:87)
    at net.minecraft.nbt.CompressedStreamTools.func_74794_a(CompressedStreamTools.java:82)
    at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:92)
    at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:20)
    at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:12)
    at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:343)
    at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
    at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
    at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:109)
    at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:84)
    at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:307)
    at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:182)
    at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:206)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
    at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
    Minecraft Version: 1.8.9
    Operating System: Windows 10 (amd64) version 10.0
    CPU: 12x AMD Ryzen 5 2600 Six-Core Processor
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 435778248 bytes (415 MB) / 738197504 bytes (704 MB) up to 2147483648 bytes (2048 MB)
    JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.19 Powered by Forge 11.15.1.1722 Optifine OptiFine_1.8.9_HD_U_H6 3 mods loaded, 3 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCHIJAA    mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
    UCHIJAA    FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1722.jar)
    UCHIJAA    Forge{11.15.1.1722} [Minecraft Forge] (forge-1.8.9-11.15.1.1722.jar)
    Loaded coremods (and transformers):
    GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
    Profiler Position: N/A (disabled)
    Player Count: 0 / 8; []
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'fml,forge'