Data Mapping doesn't work, when using company fields

[dsp76]

Describe the bug
We tried to send a mailing with mapping fields from contacts and their corresponding primary company fields. All fields had a value, however when trying to send a campaign it failed.
Error Message: " Letzter Ausführungs-Fehler: Das Feld darf nicht null sein."

We manually checked, that we didn't have any empty fields. Unfortunately the error message doesn't give more details about where the error occurred. Deutsche Posts confirmed, that no data has been received. Thus its probably the plugin internal validation, that stopped the sending.

To Reproduce
Steps to reproduce the behavior:
Create a print mailing campaign and map fields from contact and primary company.

Expected behavior
I should be able to use fields from the contact directly, but also from the corresponding primary company.

Screenshots

Mautic version

• Version Mautic: 3.2.5 / Plugin: 2.0.0