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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'

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?