Adding keyValue "Contact_Name" will return invalid data error When creating Quote using PHP SDK.

My current version for php sdk is version 3 and whenever I Create a quotation, sometime it returns an error of "Invalid Data" in Contact_Name. sometimes it does not return an error. here's my code for creating quotes:

$moduleAPIName = "Quotes";
            $recordOperations = new RecordOperations();
            $bodyWrapper = new BodyWrapper();
            $records = array();
            $recordClass = 'com\zoho\crm\api\record\Record';
            $record1 = new $recordClass();
            $record1->addKeyValue("Subject", $subj);
            if($customer->contact_name){

                $contact_name = $this->addSearchContact($customer);
                if(!$contact_name["success"]){

                    return $contact_name;

                }
                $zohoContactName = new $recordClass();
                $zohoContactName->addFieldValue(Contacts::id(), $contact_name["id"]);
                $record1->addKeyValue('Contact_Name', $zohoContactName);
            }

            if($basic_info->description){
                $record1->addKeyValue("Description", $basic_info->description);
            }
            if($basic_info->valid_until){
                $record1->addKeyValue("Valid_Till", new \DateTime($basic_info->valid_until));
            }
            if($basic_info->delivery_date){
                $record1->addKeyValue("Required_Delivery_Date", new \DateTime($basic_info->delivery_date));
            }

            if($pdf_route){
                $record1->addKeyValue("Quote_URL", $pdf_route);
            }

            $record1->addKeyValue("Quote_Wizard_User", Auth::user()->email);

            $inventoryLineItemList = array();
            foreach($api_items as $item) {
                $inventoryLineItem = new InventoryLineItems();
                $lineItemProduct = new LineItemProduct();
                $lineItemProduct->setId($item["product"]);
                $inventoryLineItem->setProduct($lineItemProduct);
                $inventoryLineItem->setQuantity($item["quantity"]);
                $inventoryLineItem->setListPrice($item["list_price"]);
                $discount = $item["discount"];
                if($item["discount_type"] == 'percent'){
                    $discount = $item["discount"] . "%";
                }
                $inventoryLineItem->setDiscount($discount);
                array_push($inventoryLineItemList, $inventoryLineItem);
            }
            $record1->addKeyValue("Product_Details", $inventoryLineItemList);
            array_push($records, $record1);
            $bodyWrapper->setData($records);
            $trigger = array("approval", "workflow", "blueprint");
            $bodyWrapper->setTrigger($trigger);
            $headerInstance = new HeaderMap();
            $response = $recordOperations->createRecords($moduleAPIName,$bodyWrapper, $headerInstance);

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