Bug: NullReferenceException for LightLambda on IL2CPP build using dynamic data type

[NudeNULL]

Expected behavior

The deserialization should finish without errors as it is working in Editor or Standalone builds

Actual behavior

The error appears when I try to deserialize on iOS and Android device:

NullReferenceException: Object reference not set to an instance of an object.
      at System.Linq.Expressions.Interpreter.LightLambda.MakeRunDelegateCtor (System.Type delegateType) [0x00000] in <00000000000000000000000000000000>:0 
      at System.Linq.Expressions.Interpreter.LightLambda.GetRunDelegateCtor (System.Type delegateType) [0x00000] in <00000000000000000000000000000000>:0 
      at System.Linq.Expressions.Interpreter.LightLambda.MakeDelegate (System.Type delegateType) [0x00000] in <00000000000000000000000000000000>:0 
      at System.Linq.Expressions.Expression`1[TDelegate].Compile (System.Boolean preferInterpretation) [0x00000] in <00000000000000000000000000000000>:0 
      at System.Runtime.CompilerServices.CallSite`1[T].MakeUpdateDelegate () [0x00000] in <00000000000000000000000000000000>:0 
      at System.Runtime.CompilerServices.CallSite`1[T].GetUpdateDelegate (T& addr) [0x00000] in <00000000000000000000000000000000>:0 
      at System.Runtime.CompilerServices.CallSite`1[T]..ctor (System.Runtime.CompilerServices.CallSi

Steps to reproduce

• New project

• Import jillejr.newtonsoft.json-for-unity via UPM

• Serialize/Deserialize dynamic variables from code

• Run the game on any mobile device

Details

Host machine OS running Unity Editor 👉 Windows

Unity build target 👉 Android/iOS

Newtonsoft.Json-for-Unity package version 👉 12.0.201

I was using Unity version 👉 2019.4.9f1

Checklist

• Shutdown Unity, deleted the /Library folder, opened project again in Unity, and problem still remains.
• Checked to be using latest version of the package.

[applejag]

Hi @NudeNULL! Thanks for reporting this. This is the first issue on LightLambda I've received.

I am missing some info about the types you are running.
Is that error message the entire stack trace? Because it doesn't touch any Newtonsoft.Json assembly.

If you're referring to the dynamic keyword then I'm sorry to say that IL2CPP does not support it, or anything from the Dynamic Language Runtime (DLR). Trying to compile code with System.Linq.Expressions.LightLambda will not work either as IL2CPP is a strict AOT runtime.

Could you supply the following?

• the code you run that triggers the error
• any or all types you are trying to serialize/deserialize
• list of eventual converters you are using

[NudeNULL]

Thanks @jilleJr !
Then the issue is in the dynamic keyword, and yes, this is the whole stack trace.
This issue can be closed as it is not related to the Newtonsoft Json.

[applejag]

Alright will do.

Hope you find a good solution!