Whittaker node not working in MM 2.1.2 & 2.1.3

Whittaker node is not working. I have tested this in MM 2.1.2 & 2.1.3 under Unity 2020.3.0f1 & 2020.3.2f1. I created new project & downloaded clean Map Magic 2.1.3 from package manager

Steps to reproduce:
1. Create new graph
2. Insert "Simple form" & "noise" node
3. Insert "whittaker" node from Biomes-> whittaker
4. Error occurs when connecting both the node with below error message
5. Error also occur when selecting the graph for each of the biome name slot in the node (e.g. Tropic rainforest, etc.)

Draw Generator MapMagic.Nodes.MatrixGenerators.SimpleForm200 failed:
System.InvalidCastException: Specified cast is not valid.
at (wrapper castclass) System.Object.__castclass_with_cache(object,intptr,intptr)
at MapMagic.Nodes.Biomes.BiomesSet200.CheckClearBiome (MapMagic.Nodes.IBiome layer, MapMagic.Products.TileData data) [0x00014] in E:\Unity\Map Magic v213\Assets\MapMagic\Generators\Biomes\Runtime\BiomesSet.cs:192
at MapMagic.Nodes.Biomes.Whittaker200.CheckClear (MapMagic.Products.TileData data) [0x00010] in E:\Unity\Map Magic v213\Assets\MapMagic\Generators\Biomes\Runtime\Whittaker.cs:231
at MapMagic.Nodes.Graph.ClearChangedRecursive (MapMagic.Nodes.Generator gen, MapMagic.Products.TileData data, System.Collections.Generic.Dictionary`2[TKey,TValue] processed) [0x00129] in E:\Unity\Map Magic v213\Assets\MapMagic\Nodes\Graph.cs:775
at MapMagic.Nodes.Graph.ClearChanged (MapMagic.Products.TileData data) [0x00031] in E:\Unity\Map Magic v213\Assets\MapMagic\Nodes\Graph.cs:719
at MapMagic.Nodes.Graph.ClearGenerator (MapMagic.Nodes.Generator gen, MapMagic.Products.TileData data) [0x00059] in E:\Unity\Map Magic v213\Assets\MapMagic\Nodes\Graph.cs:701
at MapMagic.Core.MapMagicObject.Clear (MapMagic.Nodes.Generator gen) [0x0002e] in E:\Unity\Map Magic v213\Assets\MapMagic\Core\MapMagicObject.cs:245
at MapMagic.Core.MapMagicObject.Refresh (MapMagic.Nodes.Generator gen1, MapMagic.Nodes.Generator gen2) [0x00012] in E:\Unity\Map Magic v213\Assets\MapMagic\Core\MapMagicObject.cs:224
at MapMagic.Nodes.GUI.GraphWindow.RefreshMapMagic (System.Boolean all, MapMagic.Nodes.Generator gen1, MapMagic.Nodes.Generator gen2) [0x0002d] in E:\Unity\Map Magic v213\Assets\MapMagic\Nodes\Editor\GraphWindow.cs:67
at MapMagic.Nodes.GUI.GraphWindow.RefreshMapMagic (MapMagic.Nodes.Generator gen) [0x00000] in E:\Unity\Map Magic v213\Assets\MapMagic\Nodes\Editor\GraphWindow.cs:58
at MapMagic.Nodes.GUI.GeneratorDraw.DrawOutlet (MapMagic.No