Custom Nodes

Hi there,

just created my first small custom nodes and recognized that sometimes they stop working or do not what they should (e.g. after deleting the geometry in Revit)! When I reload my dynamo file they seem to work fine again! I don’t have any lists in my custom nodes, only a flattening node in the beginning.

So here is my question:

Do you have any hints, suggestions or tips regarding the creation of custom nodes to make them as solid and stable as possible.

Thanks again…Regards,