输入文本名称数组 - htmlspecialchars（）期望参数1为字符串

everything works fine on my validation. see my sample below:

return [
  'description' => 'required',
];

<input type="text" name="description">

but wen i put this textbox in my form. see the code below:

<input type="text" name="load[1][load_country_portname]" />

the error came up.

htmlspecialchars() expects parameter 1 to be string

Please help.