ErrorException：试图访问 int 类型值的数组偏移量

Question

当我使用“maatwebsite/excel”：“~2.1.0”Excel package 导出数据时，我遇到了“尝试访问 int 类型值的数组偏移量”的问题。

Excel::create('Filename', function($excel) use ($data){
  $excel->sheet('Sheetname', function($sheet)use ($data) {
    $sheet->fromArray($data); //getting error on this line
  });
})->export('xls')->download('xls');

样本数据：

$data = 
 array:198 [
   0 => array:19 [
     "Id" => 1
     "First Name" => "John"
     "Last Name" => "Doe"
     "comments" => null
   ]
   1 => array:19 [
     "Id" => 2
     "First Name" => "James"
     "Last Name" => "Harrison"
     "comments" => null
   ]
   ...