I recall checking NiFi issue board and there are a number of issues with NiFi 1.13.0 with PutDatabaseRecord that forced them to rollback the changes in 1.13.1. I recommend upgrading your NiFi to the latest version or rollback to an older version. To determine the real issue, you can check the NiFi logs at NIFI_HOME/logs/nifi-app.log and it can tell you which field is causing the error. Since the error is specifying null it might be trying to insert the value null but your table might have a not null clause.
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