DOMException: Namespace Error

[z0lo13]

DOMException: Namespace Error in /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/XSD2PHP/src/com/mikebevz/xsd2php/Php2Xml.php:163
Stack trace:
#0 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/XSD2PHP/src/com/mikebevz/xsd2php/Php2Xml.php(163): DOMDocument->createElementNS('http://schema.i...', 'ns0:')
#1 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/XSD2PHP/src/com/mikebevz/xsd2php/Php2Xml.php(91): QuickBooksOnline\API\XSD2PHP\src\com\mikebevz\xsd2php\Php2Xml->parseClass(Object(QuickBooksOnline\API\Data\IPPCustomer), Object(DOMDocument), true)
#2 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/Core/Http/Serialization/XmlObjectSerializer.php(51): QuickBooksOnline\API\XSD2PHP\src\com\mikebevz\xsd2php\Php2Xml->getXml(Object(QuickBooksOnline\API\Data\IPPCustomer))
#3 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/Core/Http/Serialization/XmlObjectSerializer.php(76): QuickBooksOnline\API\Core\Http\Serialization\XmlObjectSerializer::getXmlFromObj(Object(QuickBooksOnline\API\Data\IPPCustomer))
#4 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/Core/Http/Serialization/XmlObjectSerializer.php(201): QuickBooksOnline\API\Core\Http\Serialization\XmlObjectSerializer::getPostXmlFromArbitraryEntity(Object(QuickBooksOnline\API\Data\IPPCustomer), 'customer')
#5 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/DataService/DataService.php(1440): QuickBooksOnline\API\Core\Http\Serialization\XmlObjectSerializer->Serialize(Object(QuickBooksOnline\API\Data\IPPCustomer))
#6 /home/crm/public_html/vendor/quickbooks/v3-php-sdk/src/DataService/DataService.php(807): QuickBooksOnline\API\DataService\DataService->executeObjectSerializer(Object(QuickBooksOnline\API\Data\IPPCustomer), NULL)
#7 /home/crm/public_html/app/Integrations/QuickBooksIntegration/Synchronizer/CustomerSync.php(237): QuickBooksOnline\API\DataService\DataService->Add(Object(QuickBooksOnline\API\Data\IPPCustomer))
#8 /home/crm/public_html/app/Integrations/QuickBooksIntegration/Synchronizer/CustomerSync.php(59): App\Integrations\QuickBooksIntegration\Synchronizer\CustomerSync->qbo(Object(Accounts_Record_Model))
#9 /home/crm/public_html/app/Integrations/QuickBooksIntegration/Synchronizer/CustomerSync.php(40): App\Integrations\QuickBooksIntegration\Synchronizer\CustomerSync->export()
#10 /home/crm/public_html/app/Integrations/QuickBooksIntegration/Controller.php(56): App\Integrations\QuickBooksIntegration\Synchronizer\CustomerSync->process()
#11 /home/crm/public_html/modules/Vtiger/crons/QBOCustomersSync.php(17): App\Integrations\QuickBooksIntegration\Controller->synchronizeCustomers()
#12 /home/crm/public_html/cron.php(98): Vtiger_QBOCustomersSync_Cron->process()
#13 {main}

SDK Version 6.1.4

It was discussed 6 years ago in issue #142 which presumably has been fixed

The issue persist when the functions called via cron, it goes away if the function is called directly via browser.