as

[06aug2019 21:09:34.033] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: Encountered an unexpected exception
java.lang.NullPointerException: Cannot get config value without assigned Config object present
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:787) ~[server-1.14.4-extra.jar:?]
	at net.minecraftforge.common.ForgeConfigSpec$ConfigValue.get(ForgeConfigSpec.java:682) ~[?:?]
	at net.minecraftforge.common.DimensionManager.unloadWorlds(DimensionManager.java:259) ~[?:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:844) ~[?:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:324) ~[?:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:764) ~[?:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:622) [?:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
[06aug2019 21:09:34.050] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: This crash report has been saved to: I:\Minecraft\Instances\FTB Unstable-1.14 (1)\.\crash-reports\crash-2019-08-06_21.09.34-server.txt
[06aug2019 21:09:34.050] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Stopping server
[06aug2019 21:09:34.051] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Saving players
[06aug2019 21:09:34.052] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Saving worlds
[06aug2019 21:09:34.052] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Saving chunks for level 'world'/minecraft:overworld
[06aug2019 21:09:34.053] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: Exception stopping the server
java.lang.NullPointerException: null
	at net.minecraftforge.lex.cngbb.ChunkNoGoByeBye$1.serializeNBT(ChunkNoGoByeBye.java:95) ~[?:1.14.4-1.0.2]
	at net.minecraftforge.common.capabilities.CapabilityDispatcher.serializeNBT(CapabilityDispatcher.java:127) ~[?:?]
	at net.minecraftforge.common.capabilities.CapabilityDispatcher.serializeNBT(CapabilityDispatcher.java:48) ~[?:?]
	at net.minecraftforge.common.util.WorldCapabilityData.func_189551_b(WorldCapabilityData.java:61) ~[?:?]
	at net.minecraft.world.storage.WorldSavedData.func_215158_a(WorldSavedData.java:44) ~[?:?]
	at net.minecraft.world.storage.DimensionSavedDataManager.func_212775_b(DimensionSavedDataManager.java:125) ~[?:?]
	at net.minecraft.world.server.ServerWorld.func_73042_a(ServerWorld.java:753) ~[?:?]
	at net.minecraft.world.server.ServerWorld.func_217445_a(ServerWorld.java:740) ~[?:?]
	at net.minecraft.server.MinecraftServer.func_213211_a(MinecraftServer.java:513) ~[?:?]
	at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:553) ~[?:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71260_j(DedicatedServer.java:544) ~[?:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:661) [?:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]