It’s going to be really hard to determine the issue if we can’t see your data. What are you feeding the node with the error?
The “object reference not set to an instance of an object” error essentially means that you have at least one input value that isn’t a valid object - likely a null or empty list. Check your inputs for any of these values and clean them up.
You can even see in this image that your output is null. Somewhere you have invalid or null values.