Errors in server console

[Digitalr]

Not sure, what caused problem, because there is no visual signs of it, in the world:

10.12.2020 17:01:12 [Error] An error was thrown when generating chunk column X=1599,Z=1622 - it will probably not generate correctly!. Exception System.NullReferenceException: Object reference not set to an instance of an object
  at Vintagestory.GameContent.BlockEntityMicroBlock.GetLightAbsorption () [0x00019] in <a3ab14ef20ff4f96ae39f364001d4dd5>:0 
  at Vintagestory.GameContent.BlockMicroBlock.GetLightAbsorption (Vintagestory.API.Common.IWorldChunk chunk, Vintagestory.API.MathTools.BlockPos pos) [0x00017] in <a3ab14ef20ff4f96ae39f364001d4dd5>:0 
  at Vintagestory.Common.ChunkIlluminator.SunLightFloodNeighbourChunks (Vintagestory.API.Common.IWorldChunk[] curChunks, System.Int32 chunkX, System.Int32 chunkY, System.Int32 chunkZ) [0x00308] in <6dd462367a7f48cda76709e020ce2d8e>:0 
  at Vintagestory.Server.WorldAPI.SunFloodChunkColumnNeighboursForWorldGen (Vintagestory.API.Common.IWorldChunk[] chunks, System.Int32 chunkX, System.Int32 chunkZ) [0x000aa] in <6dd462367a7f48cda76709e020ce2d8e>:0 
  at Vintagestory.ServerMods.GenLightSurvival.OnChunkColumnGenerationFlood (Vintagestory.API.Server.IServerChunk[] chunks, System.Int32 chunkX, System.Int32 chunkZ, Vintagestory.API.Datastructures.ITreeAttribute chunkGenParams) [0x0000b] in <a3ab14ef20ff4f96ae39f364001d4dd5>:0 
  at Vintagestory.Server.ServerSystemSupplyChunks.TryPopulateChunk (Vintagestory.Server.ChunkColumnGetRequest chunkRequest) [0x0010b] in <6dd462367a7f48cda76709e020ce2d8e>:0 

VS server v1.14.2.