Problem during Update

Attempt to assign property "extensionset" on null

.../libraries/src/Updater/Update.php:306



301             // For everything else there's...the default!

302             default:

303                 $name = strtolower($name);

304 

305                 if (!isset($this->currentUpdate->$name)) {

306                     $this->currentUpdate->$name = new \stdClass();

307                 }

308 

309                 $this->currentUpdate->$name->_data = '';

310 

311                 foreach ($attrs as $key => $data) {