diff --git a/src/NestedForm.php b/src/NestedForm.php
index edfcd33..961a7fc 100644
--- a/src/NestedForm.php
+++ b/src/NestedForm.php
@@ -344,7 +344,7 @@ protected function fillAttributeFromRequest(NovaRequest $request, $requestAttrib
     {
         if ($model->exists) {
             $newRequest = NovaRequest::createFrom($request);
-            if (!$model->{$model->getKeyName() && $request->has($model->getKeyName())}) {
+            if (!$model->{$model->getKeyName()} && $request->has($model->getKeyName())) {
                 $model->{$model->getKeyName()} = $request->get($model->getKeyName());
             }
             $children = collect($newRequest->get($requestAttribute));