Clean but sudden server crash

Using EWG 7.2.29 on Spigot 1.12.1 (git-Spigot-65e8124-963b19c), received this error:

[13:59:15] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NoSuchMethodError: net.minecraft.server.v1_12_R1.TileEntity.a(Lnet/minecraft/server/v1_12_R1/NBTTagCompound;)V
        at com.minelazz.epicworldgenerator.nativeAPI.implementations.v1_12_R1.NMSImplementation.a(NMSImplementation.java:146) ~[?:?]
        at com.minelazz.epicworldgenerator.structures.StructureObject.a(StructureObject.java:109) ~[?:?]
        at com.minelazz.epicworldgenerator.biome.EpicBiome.a(EpicBiome.java:404) ~[?:?]
        at com.minelazz.epicworldgenerator.nativeAPI.implementations.v1_12_R1.generator.b.recreateStructures(b.java:376) ~[?:?]
        at net.minecraft.server.v1_12_R1.Chunk.a(Chunk.java:964) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at net.minecraft.server.v1_12_R1.Chunk.loadNearby(Chunk.java:939) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at org.bukkit.craftbukkit.v1_12_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:53) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at org.bukkit.craftbukkit.v1_12_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at org.bukkit.craftbukkit.v1_12_R1.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:188) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at org.bukkit.craftbukkit.v1_12_R1.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:347) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at org.bukkit.craftbukkit.v1_12_R1.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:34) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:763) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) ~[spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.1.jar:git-Spigot-65e8124-963b19c]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_102]
[13:59:15] [Server thread/ERROR]: This crash report has been saved to: /home/mc/devoted/./crash-reports/crash-2017-08-14_13.59.15-server.txt
[13:59:15] [Server thread/INFO]: Stopping server

followed by immediate server shutdown (safe, however, thanks!)

Crash log: Attached.

I was not in game so not sure what happened. I've disabled EWG for now. Apologies for the thin details, I've included what I know.

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