Data is Null. This method or property cannot be called on Null values

 Data is Null. This method or property cannot be called on Null values

Issue: 

Data is Null. This method or property cannot be called on Null values

Solution:

For columns that are nullable in your DB tables:

Wrong

 public string Memo { get; set; }

Correct: 

 public string? Memo { get; set; }

Hope this will help you and save your time.

Enjoy !!!

:)