Cannot read property 'originalPOSIdentity' of undefined

Hello. Just started writing some advanced scripts. Fencing an issue:
My array could have from 2 to infinite number of entities. My task is find parse the originalPOSIdentity from response and to compare it to some value. One of arrays do not have the originalPOSIdentity property. That`s why I get Cannot read property ‘originalPOSIdentity’ of undefined.

Body:

{
    "receipt": {
        "delta": false,
        "entities": [
            {
                    "offset": {
                        "totalSeconds": 0,
                        "id": "Z",
                        "rules": {
                            "transitionRules": [],
                            "transitions": [],
                            "fixedOffset": true
                        }
                    },
                    "hour": 18,
                    "minute": 56,
                    "nano": 627000000,
                    "second": 37,
                    "dayOfMonth": 3,
                    "dayOfWeek": "WEDNESDAY",
                    "month": "FEBRUARY",
                    "year": 2021,
                    "dayOfYear": 34,
                    "monthValue": 2
                },
                "id": 0,
                "input": false,
                "invalidated": false,
                "layout": {
                    "type": "DSL",
                        {
                            "cells": [
                                {
                                    "text": "SA: 1",
                                    "width": 45
                                },
                                {
                                    "text": "Store: 9101",
                                    "width": 35
                                },
                                {
                                    "align": "RIGHT",
                                    "text": "No: 31",
                                    "width": 20
                                }
                            ]
                        },
                        {
                            "cells": [
                                {
                                    "text": "Date: 2021-02-03",
                                    "width": 45
                                },
                                {
                                    "text": "Till: 99",
                                    "width": 30
                                },
                                {
                                    "align": "RIGHT",
                                    "text": "Time: 20:56",
                                    "width": 25
                                }
                            ]
                        },
                        {
                            "cells": [
                                {
                                    "text": "-",
                                    "truncate": "CUT",
                                    "type": "TEXT_FILL",
                                    "width": 100
                                }
                            ]
                        }
                    ]
                },
                "type": "DECORATOR"
            },
            {
                 "id": 13,
                "input": true,
                "invalidated": false,
                "layout": {
                    "type": "DSL",

                },
                "saleItem": {
                    "actualUnitPrice": 100.00,
                    "extendedAmount": 100.00,
                    "name": "***",
                    "originalPOSIdentity": "02000011111019",
                    "quantity": {
                        "unitOfMeasure": "EA",
                        "value": 1.00
                    }
                },
                "type": "SALE_ITEM"
            },...

Temporary solution:

var originalPOSIdentity = pm.environment.get("item1");

for (i in data.receipt.entities) {
    if (data.receipt.entities[i].type === "SALE_ITEM") {
        if (data.receipt.entities[i].saleItem.originalPOSIdentity === originalPOSIdentity) {
            pm.environment.set("entityId", data.receipt.entities[i].id);
        }
    }
}

By I know that there is a better way to find the originalPOSIdentity. Can someone help me?