src/Payum/Core/Bridge/Spl/ArrayObject.php
public function offsetUnset($index)
    {
        if ($this->input) {
            unset($this->input[$index]);
        }

        return parent::offsetUnset($index);
    }
public function offsetUnset($index)
    {
        if ($this->input) {
            unset($this->input[$index]);
        }

        return parent::offsetUnset($index);
    }
{@inheritDoc}