Opencart 3 Price Per Piece of Option Price - php

Question

In Opencart 3.0.2.0 version, I am doing a calculation that divides the Option price by the Quantity.
First I take the option name as pcs and convert it to int. (Example Option Names: 25, 50, 75, 100)
Then I divide the value in the Product name by the total price written and assign it to a variable.
The first data is empty. How can I resolve this situation? I am sharing the screenshot for error;
https://www.hizliresim.com/dac9o14
My Codes:
$optionPerPrice = '';
if(isset($option['option_id']) && $option['option_id'] == 14) {
foreach($product_option_value_data as $optionPerPrice) {
$perQuantity = intval($optionPerPrice['name']);
$perPrice = floatval($optionPerPrice['price']);
$optionPerPrice = $perPrice / $perQuantity;
}
}
$product_option_value_data[] = array(
'product_option_value_id' => $option_value['product_option_value_id'],
'option_value_id' => $option_value['option_value_id'],
'name' => $option_value['name'],
'image' => $this->model_tool_image->resize($option_value['image'], 50, 50),
'price' => $price,
'price_prefix' => $option_value['price_prefix'],
'optionPerPrice' => $optionPerPrice,
);
}
}
$data['options'][] = array(
'product_option_id' => $option['product_option_id'],
'product_option_value' => $product_option_value_data,
'option_id' => $option['option_id'],
'name' => $option['name'],
'type' => $option['type'],
'value' => $option['value'],
'required' => $option['required'],
);
}`