[SOLVED] - Dispatch note showing error/warning message

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Warning: A non-numeric value encountered in /var/www/vhosts/122/346133/webspace/httpdocs/theplanter.nl/vqmod/vqcache/vq2-admin_controller_sale_order.php on line 1907

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

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				$shipping_address = str_replace(array("\r\n", "\r", "\n"), '<br />', preg_replace(array("/\s\s+/", "/\r\r+/", "/\n\n+/"), '<br />', trim(str_replace($find, $replace, $format))));

				$this->load->model('tool/upload');

				$product_data = array();

				$products = $this->model_sale_order->getOrderProducts($order_id);

				foreach ($products as $product) {
					$option_weight = '';

					$product_info = $this->model_catalog_product->getProduct($product['product_id']);

					if ($product_info) {
						$option_data = array();

						$options = $this->model_sale_order->getOrderOptions($order_id, $product['order_product_id']);

						foreach ($options as $option) {
							if ($option['type'] != 'file') {
								$value = $option['value'];
							} else {
								$upload_info = $this->model_tool_upload->getUploadByCode($option['value']);

								if ($upload_info) {
									$value = $upload_info['name'];
								} else {
									$value = '';
								}
							}

							$option_data[] = array(
								'name'  => $option['name'],
								'value' => $value
							);

							$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'];
								}
							}
						}

						$product_data[] = array(
							'name'     => $product_info['name'],
							'model'    => $product_info['model'],
							'option'   => $option_data,
							'quantity' => $product['quantity'],
							'location' => $product_info['location'],
							'sku'      => $product_info['sku'],
							'upc'      => $product_info['upc'],
							'ean'      => $product_info['ean'],
							'jan'      => $product_info['jan'],
							'isbn'     => $product_info['isbn'],
							'mpn'      => $product_info['mpn'],
							'weight'   => $this->weight->format(($product_info['weight'] + (float)$option_weight) * $product['quantity'], $product_info['weight_class_id'], $this->language->get('decimal_point'), $this->language->get('thousand_point'))
						);
					}
				}

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$option_weight = '';

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$option_weight = 0.00;