Error in headerFunctions.php : Parameter must be an array

2020-03-19 14:58:18.888 ***** ERROR ***** [V8.3.2] on file 'C:\wamp64\www\ipmp_new\report\headerFunctions.php' at line (54)
2020-03-19 14:58:18.893 ***** ERROR ***** [V8.3.2] cause = count(): Parameter must be an array or an object that implements Countable

$queryWhere = ($queryWhere == '') ? ' 1=1' : $queryWhere;
$query = 'select ' . $querySelect
    . ' from ' . $queryFrom
    . ' where ' . $queryWhere;
$result = Sql::query($query);
if (checkNoData($result)) exit; // The error occurs in that function

select `id`, DATE_FORMAT(`externalValidation`, '%Y%m%d') `delivered`, DATE_FORMAT(`externalValidationScheduled`, '%Y%m%d') `planned`, DATE_FORMAT(`externalValidation`, '%Y-%m') `interval` from `document` where `idProject` IN (0, 100) AND `externalValidationScheduled` IS NOT NULL AND `externalValidation` BETWEEN '2020-03-01' AND '2021-02-28' AND `idDocumentType` = '63'

function checkNoData($result, $month=null) {
  global $outMode;
  if (count($result)==0) { // Error is thrown here