ConstraintError: Key already exists in the object store

[Md Mostofa]

I am working with React 16.3.2, Redux 4 and Dexie 2.0.3.

when I am going to store data second time it throws this error message.

Error: ConstraintError: Key already exists in the object store.




   return dispatch => {
        db.table
        .add(data)
        .then (function(id){
            console.log(id)
        })
        .catch (function (error) {
            console.log("Error: " + error);
        });
    }

The first time it stores date well but after it gives the error.

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