Fatal error while importing variant select field

[ascheider]

I have a class field country_layout which is simple dropdown

After the import i get the exception. See Trace

trace.txt

The $siblings is loaded as Listing ant then you are trying to add the $item in line 4005 like in array.

[BlackbitDevs]

Which DD version?

[BlackbitDevs]

Think I found it. Can you please check 3.6.x-dev? Have added this:

$siblings = $parentElement->getChildren([AbstractObject::OBJECT_TYPE_OBJECT, AbstractObject::OBJECT_TYPE_VARIANT], true);
if($siblings instanceof AbstractListing) {
    $siblings = $siblings->load();
}

[ascheider]

@BlackbitDevs Yes. Thanks. It helps. I think you can merge it.

[BlackbitDevs]

Released 3.6.41.

I have to admit that the "Optimize inheritance" feature is used only by a few clients. If you see any problems with it, please notify me.