Hook afterInsert for collection donated_items result ignored

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I want to set two values for my database record. One value is the field itemId is the number of record of of the database , and the second fields is to set the as “0”.
I used the afterInsert callback:

export function donated_items_afterInsert(item, context) {
let numOfResults;
wixData.query( “donated_items” ).find().then((results) => {
numOfResults= results.totalCount;
});

wixData.get( "donated_items" , item._id).then((toUpdate) => { 
    toUpdate.itemNumber = Number(numOfResults); 
    toUpdate.doneeId =  "0" ; 
    wixData.update( "donated_items" , toUpdate); 
    }) 
}

But I got the following errors during insertion:

Hook afterInsert for collection donated_items result ignored! Expected hook result to resolve to an object with an ‘_id’ property, but got [Undefined]

My questions are:

  1. is there a better way to do this?
  2. what is wrong with the _id? I just update the same item just inserted.

Thanks!

Hugo