Type Error Argument 1 passed to DOMDocument::importNode() must be an instance of DOMNode, null given

[Smolinsky]

Argument 1 passed to DOMDocument::importNode() must be an instance of DOMNode, null given
in /home/vagrant/code/comfort/taxi_comfort/vendor/wbraganca/yii2-dynamicform/DynamicFormWidget.phpat line 184
$document->appendChild($document->importNode($results->first()->getNode(0), true));

in method create. How to fix this?

[favourkiiza]

same problem here. Any fix?