致命错误：未捕获错误：在bool

Question

我在SQL上遇到一些问题，提示“致命错误：未捕获的错误：在bool上调用成员函数fetch_object（）”，我已尽力解决了这个问题，但后来变得混乱了。请帮助

$cekFore3 = $koneksi->query("SELECT fore3 from peramalan ORDER BY id_produk DESC LIMIT 1");
$cekFore5 = $koneksi->query("SELECT fore5 from peramalan ORDER BY id_produk DESC LIMIT 1");

while($data3 = $cekFore3->fetch_object()) {
    $d3[] = $data3;
}
foreach ($d3 as $val3) {
    $e3 = $val3->sma3;
} // LAST FORECAST VALUE 3

while ($data5 = $cekfore5->fetch_object()) {
    $d5[] = $data5;
}
foreach ($d5 as $val5) {
    $e5 = $val5->sma5;
} // LAST FORECAST 5