Crash report from Dynamo 2.18.1.5096

[tinrobot2000]

Issue Description

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

Dynamo version

Dynamo: 2.18.1.5096

Operating system

OS: Microsoft Windows NT 10.0.19044.0

What did you do?

Trying to get the Revit categories from a Binding class OUT = [pb.Categories for pb in doc.ParameterBindings]

What did you expect to see?

A list of categories

What did you see instead?

Null (Object reference not set to an instance of an object.)

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

None

Stack Trace

Object reference not set to an instance of an object.

   at Autodesk.Revit.DB.Category.GetHashCode()
   at System.Collections.Generic.Dictionary`2.Remove(TKey key)
   at ProtoFFI.CLRObjectMarshaler.OnDispose(StackValue dsObject, Context context, Interpreter dsi)
   at ProtoFFI.DisposeFunctionPointer.Execute(Context c, Interpreter dsi, List`1 s)
   at ProtoCore.Lang.FFIFunctionEndPoint.Execute(Context c, List`1 formalParameters, StackFrame stackFrame, RuntimeCore runtimeCore)
   at ProtoCore.CallSite.DispatchDispose(StackValue stackValue, RuntimeCore runtimeCore)
   at ProtoCore.DSASM.Executive.CallDispose(ProcedureNode fNode, StackValue svThisPtr, Int32 classIndex)
   at ProtoCore.DSASM.Heap.GCDisposeObject(StackValue svPtr, Executive exe)
   at ProtoCore.DSASM.Heap.Sweep()
   at ProtoCore.DSASM.Heap.SingleStep(Boolean forceGC)
   at ProtoCore.DSASM.Heap.FullGC(IEnumerable`1 gcroots, Executive exe)
   at ProtoScript.Runners.LiveRunner.ApplyUpdate()
   at ProtoScript.Runners.LiveRunner.CompileAndExecuteForDeltaExecution(List`1 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()

---

CLR: 4.0.30319.42000

EDIT Resolves with restart of Revit (Not just Dynamo) but always happens on re-run of script minimal example code OUT = [pb.get_Categories() for pb in doc.ParameterBindings]

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[andydandy74]

I've seen this kind of error more times than I can count when working with categories in python nodes, always when re-running a script. Super annoying.