More detail on Value of type undefined not recognized exception

**Is your feature request related to a problem? Please describe.**
In case the object we want to write has an undefined value, the following exception is raised: `Value of type undefined not recognized`. It would make the problem identification much more easy if we could get the place/field the process found the problem.
**Describe the solution you'd like**
Two way iIcan imagine:
- in the error message it mention least the first element that triggered the exception.
- an additional field on the Error object like: effected_field ; that contains the name of the filed the exception triggered on.