Cara mengatasinya bagaimana ya?

Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, bool given in C:\xampp\htdocs\e-pemira\sistem\input_data_paslon.php on line 187

$data_calon = mysqli_query($koneksi,"SELECT * FROM data_calon");
while($d = mysqli_fetch_array($data_calon)){