Issue Description

Please fill in the following information to help us reproduce the issue:

Dynamo version

Dynamo: 2.15.1.6076

Operating system

OS: Microsoft Windows NT 10.0.19045.0

What did you do?

I edited Dynamo graph and pressed run for second time. After every change in graph this happend.

What did you expect to see?

I expected Dynamo to work as usual. Error ocurred and I had to restart Dynamo.

What did you see instead?

Specified cast is not valid.

at ProtoCore.DSASM.Heap.ToHeapObject[T](StackValue heapObject) at ProtoCore.DSASM.Executive.POP_helper(Instruction instruction, Int32& blockId, Int32& dimensions) at ProtoCore.DSASM.Executive.POP_Handler(Instruction instruction) at ProtoCore.DSASM.Executive.Execute(Int32 exeblock, Int32 entry, Language language) at ProtoCore.DSASM.Executive.Execute(Int32 exeblock, Int32 entry, List1 breakpoints, Language language) at ProtoCore.DSASM.Executive.BounceUsingExecutive(Executive executive, Int32 exeblock, Int32 entry, StackFrame stackFrame, Int32 locals, Boolean fepRun, Executive exec, List1 breakpoints) at ProtoScript.Runners.ProtoScriptRunner.ExecuteLive(Core core, RuntimeCore runtimeCore) at ProtoScript.Runners.LiveRunner.Execute(Boolean isCodeCompiled) at ProtoScript.Runners.LiveRunner.CompileAndExecute(List1 astList) at ProtoScript.Runners.LiveRunner.CompileAndExecuteForDeltaExecution(List1 astList) at ProtoScript.Runners.LiveRunner.SynchronizeInternal(GraphSyncData syncData) at ProtoScript.Runners.LiveRunner.UpdateGraph(GraphSyncData syncData) at Dynamo.Scheduler.UpdateGraphAsyncTask.HandleTaskExecutionCore() at Dynamo.Scheduler.AsyncTask.Execute()

What packages or external references (if any) were used?

Civil3DToolkit Camber

Stack Trace

(From the Dynamo crash window select 'Details' -> 'Copy' and paste here)