Swift UI String Fatal error: ‘try!’ expression unexpectedly raised an error

Error at on string property while decoding the json data in Swift UI:

Fatal error: 'try!' expression unexpectedly raised an error: 
Swift.DecodingError.valueNotFound(Swift.UnkeyedDecodingContainer, 
Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue:intValue: nil)],
debugDescription: "Cannot get unkeyed decoding container 
-- found null value instead.", underlyingError: nil))

The solution is to replace the property declaration from this:

    let yourStringProperty: String

to this

    let yourStringProperty: String?

i.e make it optional and set to accept nil.

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