Crash game - Parameter 'startIndex'

[C4BR3R4]

Crash game to 'UrineColor' is not defined.

Critical error occurred in the following mod: naturescall@1.3.5
System.ArgumentOutOfRangeException: startIndex cannot be larger than length of string. (Parameter 'startIndex')
   at System.String.ThrowSubstringArgumentOutOfRange(Int32 startIndex, Int32 length)
   at System.String.Substring(Int32 startIndex, Int32 length)
   at Vintagestory.API.MathTools.ColorUtil.Hex2Doubles(String hex) in VintagestoryApi\Math\ColorUtil.cs:line 621
   at NaturesCall.Network.BladderNetwork.SpawnPeeParticles(Entity byEntity, BlockPos pos, Vec3d hitPos, String color, Boolean shouldDieOnContact, Single particleLifetime) in /Users/jacopouggeri/workspace/VintageModding/NaturesCall/NaturesCall/Network/BladderNetwork.Action.cs:line 264
   at NaturesCall.Network.BladderNetwork.OnServerPeeMessage(Response response) in /Users/jacopouggeri/workspace/VintageModding/NaturesCall/NaturesCall/Network/BladderNetwork.Action.cs:line 24
   at Vintagestory.Client.NoObf.NetworkChannel.<>c__DisplayClass12_0`1.<SetMessageHandler>b__0(Packet_CustomPacket p) in VintagestoryLib\Client\API\NetworkChannel.cs:line 74
   at Vintagestory.Client.NoObf.NetworkAPI.HandleCustomPacket(Packet_Server packet) in VintagestoryLib\Client\API\NetworkAPI.cs:line 148
   at Vintagestory.Client.NoObf.ClientMain.ExecuteMainThreadTasks(Single deltaTime) in VintagestoryLib\Client\ClientMain.cs:line 786
   at Vintagestory.Client.GuiScreenRunningGame.RenderToPrimary(Single dt) in VintagestoryLib\Client\MainMenu\Screens\GuiScreenRunningGame.cs:line 172
   at Vintagestory.Client.ScreenManager.Render(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 719
   at Vintagestory.Client.ScreenManager.OnNewFrame(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 663
   at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame(FrameEventArgs e) in VintagestoryLib\Client\ClientPlatform\GameWindow.cs:line 113
   at OpenTK.Windowing.Desktop.GameWindow.Run()
   at Vintagestory.Client.ClientProgram.Start(ClientProgramArgs args, String[] rawArgs) in VintagestoryLib\Client\ClientProgram.cs:line 338
   at Vintagestory.Client.ClientProgram.<>c__DisplayClass10_0.<.ctor>b__1() in VintagestoryLib\Client\ClientProgram.cs:line 133
   at Vintagestory.ClientNative.CrashReporter.Start(ThreadStart start) in VintagestoryLib\Client\ClientPlatform\ClientNative\CrashReporter.cs:line 95