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The game crashed whilst exception in server tick loop
Error: java.lang.IllegalArgumentException: ChunkNibbleArrays should be 2048 bytes not: 0

and then this

---- Minecraft Crash Report -------- Minecraft Crash Report ----
WARNING: coremods are present: MalisisCorePlugin (MalisisCore-1.12.2.jar)Contact their authors BEFORE contacting forge
// Why did you do that?
Time: 12/14/19 7:59 PMDescription: Exception in server tick loop
java.lang.IllegalArgumentException: ChunkNibbleArrays should be 2048 bytes not: 0 at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:16) at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:449) at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:128) at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:92) at net.minecraftforge.common.chunkio.ChunkIOProvider.run(ChunkIOProvider.java:70) at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:92) at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118) at net.minecraft.world.gen.ChunkProviderServer.func_186028_c(ChunkProviderServer.java:89) at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:135) at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:344) at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:142) at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:156) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) 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: 1.12.2 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 838349608 bytes (799 MB) / 1543503872 bytes (1472 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 9.42 Powered by Forge 14.23.5.2838 23 mods loaded, 23 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
| State | ID | Version | Source | Signature | |:------ |:----------------- |:--------------- |:---------------------------------------------- |:---------------------------------------- | | LCHIJA | minecraft | 1.12.2 | minecraft.jar | None | | LCHIJA | mcp | 9.42 | minecraft.jar | None | | LCHIJA | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2838.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | LCHIJA | forge | 14.23.5.2838 | forge-1.12.2-14.23.5.2838.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | LCHIJA | securitycraft | v1.8.11 | [1.12.2]+SecurityCraft+v1.8.11.jar | None | | LCHIJA | arcademod | 2.1.5 | arcademod-2.1.5-1.12.2.jar | None | | LCHIJA | bookworm | 1.12.2-2.2.0 | bookworm+-+2.2.0+(1.12.2).jar | None | | LCHIJA | cdm | 0.4.1 | cdm-0.4.1-mc1.12.2.jar | None | | LCHIJA | cfm | 6.2.0 | cfm-6.2.0-mc1.12.2.jar | None | | LCHIJA | culinaryconstruct | 1.3.2 | culinaryconstruct-1.3.2.jar | 5d5b8aee896a4f5ea3f3114784742662a67ad32f | | LCHIJA | customnpcs | 1.12 | CustomNPCs_1.12.2(09jul18).jar | None | | LCHIJA | fnaf | 1.12.2-V12 | Five-Nights-at-Freddys-Universe-Mod-1.12.2.jar | None | | LCHIJA | jei | 4.14.4.264 | jei_1.12.2-4.14.4.264.jar | None | | LCHIJA | lunatriuscore | 1.2.0.42 | LunatriusCore-1.12.2-1.2.0.42-universal.jar | None | | LCHIJA | malisiscore | 1.12.2-6.4.0 | MalisisCore-1.12.2.jar | None | | LCHIJA | malisisdoors | 1.12.2-7.3.0 | MalisisDoors-Mod-1.12.2.jar | None | | LCHIJA | pizzacraft | 1.2.5 | PizzaCraft-Mod-1.12.2.jar | None | | LCHIJA | schematica | 1.8.0.169 | Schematica-1.12.2-1.8.0.169-universal.jar | None | | LCHIJA | thutcore | 5.19.7 | thutcore-1.12.2-5.19.7.jar | None | | LCHIJA | thutcore_compat | 1.0 | thutcore-1.12.2-5.19.7.jar | None | | LCHIJA | thuttech | 6.1.4 | thuttech-1.12.2-6.1.4.jar | None | | LCHIJA | worldedit | 6.1.10-SNAPSHOT | WorldEdit-1.12.2.jar | None | | LCHIJA | xlfoodmod | 1.12.2-1.8.0 | XL-Food-Mod-1.12.2.jar | None |
Loaded coremods (and transformers): MalisisCorePlugin (MalisisCore-1.12.2.jar) 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'

any help is appreciated.

Some world gen issues it seems, is there a mod that adds world gen (ores, mobs, crops, etc) you could remove that would stop it from conflicting?

Do you have a backup at all you can go back to before this happened?

If not, not much else that can be done, you'll just have to remove a few mods until it works or create a new world.

This is caused by world corruption; one or more chunks is missing some of its data and needs to be deleted (it might be possible to fix the chunk by adding a properly sized NBT byte array, which needs to be 2048 bytes for "data", "blocklight" and "skylight". Unfortunately, the report doesn't say which chunk is causing the error). You can mention the issue in the following thread, including a link to the world download and the mods you are using (so they can test it):

https://www.minecraftforum.net/forums/minecraft-java-edition/discussion/297844-official-corrupted-save-recovery-thread

You could also try using the following tool; be aware that it might replace chunks containing anything that you've built, so make a backup before running it (you could try opening the world with MCEdit and if it can load the chunks you can try copying their blocks to the world after they are deleted):

https://github.com/Fenixin/Minecraft-Region-Fixer