Bug when unpack specifc data

[crazynds]

The following code throws an erro:

<?php

$this->bin = new Binn();
$data = $this->bin->serialize([
    [
        "Astrá",
        6,
    ]
]);
$this->bin->unserialize($data);

Error:

ErrorException {#2094 ▼ // vendor\knik\binn\src\BinnAbstract.php:457
  #message: "unpack(): Type C: not enough input values, need 1 values but only 0 were provided"
  #code: 0
  #file: "
C:\Users\Administrator\Desktop\workspace\PCare\vendor
\knik\binn\
src\BinnAbstract.php"
  #line: 454
  #severity: E_WARNING

The error disapear if:

• If I remove the number in the end of the array
• If I remove the string element
• If I swap the order of the elements in array
• If the array is only one deep
• If I remove the character 'á'

If I add other elements to array in any order, the exception occurr in the same way.