I really do not enjoy debugging pulumi 😞 this is error says absolutely nothing

transformed: Input[U] = func(value)
    TypeError: sequence item 6: expected str instance, NoneType found
    error: an unhandled error occurred: Program exited with non-zero exit code: 1

TypeError is a python stdlib error: https://docs.python.org/3/library/exceptions.html#TypeError

Yeah, the fun fact is that the object throwing this error receives many lists and expects a JSON so the error thrown is not really helpful.