Object cannot be stored in an array of this type. issue in MVC c#

Question

I am facing below issue on production application and not able to found any specific location or code as a cause of the error can anyone having any idea then please suggest a solution.

message="Object cannot be stored in an array of this type."    
source="mscorlib"    
detail="System.InvalidCastException: Object cannot be stored in an array of this type.
   
at System.Array.InternalSetValue(Void* target, Object value)
   
at System.Array.SetValue(Object value, Int32[] indices)
   
at System.Runtime.Serialization.ObjectManager.CompleteObject(ObjectHolder holder, Boolean bObjectFullyComplete)
   
at System.Runtime.Serialization.ObjectManager.DoNewlyRegisteredObjectFixups(ObjectHolder holder)
   
at System.Runtime.Serialization.ObjectManager.RegisterObject(Object obj, Int64 objectID, SerializationInfo info, Int64 idOfContainingObj, MemberInfo member, Int32[] arrayIndex)
   
at System.Runtime.Serialization.Formatters.Binary.ObjectReader.RegisterObject(Object obj, ParseRecord pr, ParseRecord objectPr, Boolean bIsString)
   
at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ParseObjectEnd(ParseRecord pr)
   
at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run()
   
at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage)
   
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage)
   
at System.Web.Util.AltSerialization.ReadValueFromStream(BinaryReader reader)
   
at System.Web.SessionState.SessionStateItemCollection.ReadValueFromStreamWithAssert()
   
at System.Web.SessionState.SessionStateItemCollection.DeserializeItem(String name, Boolean check)
   
at System.Web.SessionState.SessionStateItemCollection.get_Item(String name)
   
at System.Web.HttpSessionStateWrapper.get_Item(String name)
   
at System.Web.Mvc.SessionStateTempDataProvider.LoadTempData(ControllerContext controllerContext)
   
at System.Web.Mvc.TempDataDictionary.Load(ControllerContext controllerContext, ITempDataProvider tempDataProvider)
   
at System.Web.Mvc.Controller.PossiblyLoadTempData()
   
at System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state)
   
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   
at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state)
   
at System.Web.Mvc.MvcHandler.<>c.<BeginProcessRequest>b__20_0(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState)
   
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   

at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
   
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)"    user="extranet\0031O00003QP1nTQAT"    
time="2020-06-10T13:54:03.7681729Z">

Answer 1

I know its late, but I am curious if there was any development on this.

The "System.Web.Mvc.TempDataDictionary.Load" in the error definitely gives the clue that, this is something do with data stored in TempData. I also experienced the problem, but I could not exactly identify what data created the problem, because the code was abusing temp data a lot. Good news is that, I removed the code that uses TempData to store complex types. Its been 30 days and the exception is not happening again. Voila..!

https://github.com/dotnet/runtime/issues/28159