Insert data xml to database pada laravel

Sore, saya mempunyai respon data xml seperti berikut :

<resp_postpaidpayment>
<date_time>20191105005009</date_time>
<trxID>1572889809444</trxID>
<idno>211001828100</idno>
<rc>00</rc>
<namaPelanggan>UDIN</namaPelanggan>
<tarif>  S1</tarif>
<daya>1300</daya>
<tglTransaksi>05/11/2019</tglTransaksi>
<tglBayar>05/11/2019 00:50:06</tglBayar>
<tilp></tilp>
<data>
	<dataPembayaran>
		<blth>MEI16</blth>
		<meterAwal>00000000</meterAwal>
		<meterAkhir>00000000</meterAkhir>
		<rpTag>000000120000</rpTag>
		<rpBK>000000010000</rpBK>
		<admBank>000000003000</admBank>
		<jmlTagihan>133000</jmlTagihan>
		<reffNo>0213170Z83E7D162FA135</reffNo>
		<sisaTagihan>1</sisaTagihan>
	</dataPembayaran>
	<dataPembayaran>
		<blth>JUN16</blth>
		<meterAwal>00000000</meterAwal>
		<meterAkhir>00000000</meterAkhir>
		<rpTag>000000430000</rpTag>
		<rpBK>000000010000</rpBK>
		<admBank>000000003000</admBank>
		<jmlTagihan>443000</jmlTagihan>
		<reffNo>0213170Z83E7D162FA13580B178CF459</reffNo>
		<sisaTagihan>0</sisaTagihan>
	</dataPembayaran>
	<pesanSponsor>Rincian Tag. Dapat Di Cek Langsung saja ke "Web" www.pln.co.id. Atau Chat wa 123</pesanSponsor>
</data>
</resp_postpaidpayment>

Xml tersebut ingin saya simpan ke database menjadi dua data berdasarkan <dataPembayaran>. Berikut kode yang saya tulis :

......(query sebelumnya)......
$inqMsgRespons = //TERIMA DATA XML
$response = simplexml_load_string($inqMsgRespons);

foreach($response->data as $isi){

	for($i = 0; $i < count($isi); $i++){
		$data = new Transactions();
		$data->user_id = Auth::user()->id;
		$data->produk = $request->produk;
		$data->date_time = $response->date_time;
		$data->trxID = $response->trxID;
		$data->idno = $response->idno;
		$data->reffNo = $isi->dataPembayaran[$i]->reffNo; //LINE 94
		$data->rc = $response->rc;
		$data->namaPelanggan = $response->namaPelanggan;
		$data->tarif = $response->tarif;
		$data->daya = $response->daya;
		$data->blth = $isi->dataPembayaran[$i]->blth;
		$data->jmlBulan = 2;
		$data->meterAwal = $isi->dataPembayaran[$i]->meterAwal;
		$data->meterAkhir = $isi->dataPembayaran[$i]->meterAkhir;
		$data->rpTag = $isi->dataPembayaran[$i]->rpTag;
		$data->rpBK = $isi->dataPembayaran[$i]->rpBK;
		$data->admBank = $request->admBank;
		$data->jmlTagihan = $isi->dataPembayaran[$i]->jmlTagihan;
		$data->save();

	}
}

return redirect('/');

Kode tersebut BERHASIL menyimpan dua data berdasarkan <dataPembayaran> kedalam database, tetapi menampilkn eror berikut :

(1/1) ErrorException

Trying to get property 'reffNo' of non-object
in TransactionController.php line 94
at HandleExceptions->handleError(8, 'Trying to get property \'reffNo\' of non-object', 'C:\\xampp\\htdocs\\SMBAYAR\\app\\Http\\Controllers\\TransactionController.php', 94, array('request' => object(Request), 'q' => 0, 'inqMsgRespons' => '<resp_postpaidpayment><date_time>20191105005009</date_time><trxID>1572889809444</trxID><idno>211001828100</idno><rc>00</rc><namaPelanggan>UDIN</namaPelanggan><tarif> S1</tarif><daya>1300</daya><tglTransaksi>05/11/2019</tglTransaksi><tglBayar>05/11/2019 00:50:06</tglBayar><tilp></tilp><data> <dataPembayaran> <blth>MEI16</blth> <meterAwal>00000000</meterAwal> <meterAkhir>00000000</meterAkhir> <rpTag>000000120000</rpTag> <rpBK>000000010000</rpBK> <admBank>000000003000</admBank> <jmlTagihan>133000</jmlTagihan> <reffNo>0213170Z83E7D162FA13580B178CF459</reffNo> <sisaTagihan>1</sisaTagihan> </dataPembayaran> <dataPembayaran> <blth>JUN16</blth> <meterAwal>00000000</meterAwal> <meterAkhir>00000000</meterAkhir> <rpTag>000000430000</rpTag> <rpBK>000000010000</rpBK> <admBank>000000003000</admBank> <jmlTagihan>443000</jmlTagihan> <reffNo>0213170Z83E7D162FA13580B178CF459</reffNo> <sisaTagihan>0</sisaTagihan> </dataPembayaran> <pesanSponsor>Rincian Tag. Dapat Di Cek Langsung saja ke "Web" www.pln.co.id. Atau Chat wa 123</pesanSponsor></data></resp_postpaidpayment>', 'response' => object(SimpleXMLElement), 'isi' => object(SimpleXMLElement), 'i' => 2, 'data' => object(Transactions)))in TransactionController.php line 94
at TransactionController->request_pln(object(Request))
at call_user_func_array(array(object(TransactionController), 'request_pln'), array(object(Request)))in Controller.php line 55
at Controller->callAction('request_pln', array(object(Request)))in ControllerDispatcher.php line 44

Eror di controller line 94, padahal menurut saya tidak ada yang salah disana.