I would suggest checking the SQL modes set in MySQL, and disabling/removing STRICT_TRANS_TABLES if it is enabled. I believe this might be enabled by default in MySQL 5.7 and later - however in the MySQL section of the AtoM installation docs we recommend setting different default SQL modes. See the bottom half of this section:
If you want to check or change the SQL modes of an installation, the following page might help:
If you're new to using the MySQL command prompt, we have basic instructions on how to access it, and how to find out your MySQL credentials if you don't know them, here:
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