An exception occurred executing JS interop: the JSON value could not be converted to system.nullable`1[system.int64]. Path: $[0].tgorderid | linenumber: 0 | bytepositioninline: 110..

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Blazor

I had used blazorIndexedDb package for blazorWASM application

Public class Orders
{
Public long? TGorderid

---remaing proprties---
}

var orders = (await manager.ToArray<Orders>("Orders")).ToList();

An exception occurred executing JS interop: The JSON value could not be converted to System.Nullable`1[System.Int64]. Path: $[0].tGorderid | LineNumber: 0 | BytePositionInLine: 110..


How to fix this issue exctly when reterive the orders

PLease help me. Thansks

What I have tried:

An exception occurred executing JS interop: The JSON value could not be converted to System.Nullable`1[System.Int64]. Path: $[0].tGorderid | LineNumber: 0 | BytePositionInLine: 110..