"RangeError: Port should be >= 0 and < 65536. Received type string ('')."

[ampledata]

The attached flow raises a RangeError when triggered.

[
    {
        "id": "af8f44169b80f90d",
        "type": "tab",
        "label": "Flow 5",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "1ec0fdf6a0ce55e4",
        "type": "comment",
        "z": "af8f44169b80f90d",
        "name": "APRS TX Example",
        "info": "This example creates a test WorldMap payload, serializses it as an APRS packet, and sends it to the APRS-IS backbone.",
        "x": 679,
        "y": 20,
        "wires": []
    },
    {
        "id": "c0da37efde9a681d",
        "type": "inject",
        "z": "af8f44169b80f90d",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 200,
        "y": 180,
        "wires": [
            [
                "9b0b1427cb364450"
            ]
        ]
    },
    {
        "id": "9b0b1427cb364450",
        "type": "function",
        "z": "af8f44169b80f90d",
        "name": "Create WorldMap JSON",
        "func": "// APRS TX Node uses WorldMap serialized data:\nmsg.payload = {\n    'name': 'VK5IU',\n    'lat': '-35.135731',\n    'lon': '139.249263',\n    'comment': 'test comment'\n}\n\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 390,
        "y": 180,
        "wires": [
            [
                "44e6b7e8e659c35a"
            ]
        ]
    },
    {
        "id": "6dbfa429e0016cbf",
        "type": "comment",
        "z": "af8f44169b80f90d",
        "name": "APRS TX Example",
        "info": "This example creates a test WorldMap payload, serializses it as an APRS packet, and sends it to the APRS-IS backbone.",
        "x": 210,
        "y": 140,
        "wires": []
    },
    {
        "id": "44e6b7e8e659c35a",
        "type": "aprs tx",
        "z": "af8f44169b80f90d",
        "name": "VK5IU",
        "aprsConfig": "b1b93bf523013703",
        "from": "VK5IU",
        "to": "",
        "via": "",
        "server": "",
        "port": "14580",
        "x": 590,
        "y": 180,
        "wires": []
    },
    {
        "id": "b1b93bf523013703",
        "type": "aprs config",
        "filter": "",
        "name": "",
        "pass": ""
    }
]