PushNotification error

Code:

Error: Call to a member function getStatusCode() on null src/XF/Service/PushNotification.php:211

Code:

Code:

Stack trace

#0 src/XF/Service/PushNotification.php(168): XF\Service\PushNotification->handleResults()
#1 src/XF/Service/PusherTrait.php(182): XF\Service\PushNotification->sendNotifications()
#2 src/XF/Repository/UserAlert.php(163): XF\Service\Alert\Pusher->push()
#3 src/XF/Repository/UserAlert.php(114): XF\Repository\UserAlert->insertAlert()
#4...

...

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source https://xfworld.net/threads/pushnotification-error.47918/