[SOLVED] Warning "A non-numeric value encountered" error

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Warning: A non-numeric value encountered in /MY-OPENCART-EXTERNAL-STORAGE/modification/admin/controller/sale/order.php on line 1829 

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$option_weight += $product_option_value_info['weight'];

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$product_option_value_info = $this->model_catalog_product->getProductOptionValue($product['product_id'], $option['product_option_value_id']);

if ($product_option_value_info) {
	if ($product_option_value_info['weight_prefix'] == '+') {
		$option_weight += $product_option_value_info['weight'];
		} elseif ($product_option_value_info['weight_prefix'] == '-') {
		$option_weight -= $product_option_value_info['weight'];
		}
	}
}

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$option_weight += $product_option_value_info['weight'];

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$option_weight += (float)$product_option_value_info['weight'];

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$option_weight = 0;

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/MY-OPENCART-EXTERNAL-STORAGE/modification/admin/controller/sale/order.php on line 1829 

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if ($product_option_value_info) {

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if !empty($product_option_value_info['weight_prefix'])) {