Array to string conversion error on rendering attributes

Hello!

I have those errors with the uc_attribute module, in logs

[error] [client 195.225.231.201] PHP Warning: Illegal string offset 'attributes' in /var/www/sites/all/modules/ubercart/uc_attribute/uc_attribute.module on line 1293,

[error] [client 195.225.231.201] PHP Notice: Array to string conversion in /var/www/sites/all/modules/ubercart/uc_attribute/uc_attribute.module on line 1293,

[error] [client 195.225.231.201] PHP Notice: unserialize(): Error at offset 0 of 189 bytes in /var/www/sites/all/modules/ubercart/uc_product/uc_product.module on line 614

I have find out that ubercart tried to set array items on a string,
here the code

uc_attribute.module:1293

    if (!empty($values)) {
      $data = $product->data; // <----  $product->data  on some conditions is a string
      $data['attributes'] = $values;
      if (isset($product->qty)) {
        // Preserve the quantity (for product-kit sub-products).
        $qty = $product->qty;
      }

$data variable - some times exist as arrays and some time as string!

so I did check, same as in _uc_product_get_variant function

  // Ensure that $data is an array (user module leaves it serialized).
  if (isset($data) && !is_array($data)) {
    $data = unserialize($data);
  }

after this fix error is gone