When the complex rule conditions contains NULL variant_id then the library is giving error and not returing any object, eventhough it is possible to have null variant_id from API. Please fix the issue.
The attached image shows that this is not array, but integer.

When the complex rule conditions contains NULL variant_id then the library is giving error and not returing any object, eventhough it is possible to have null variant_id from API. Please fix the issue.
The attached image shows that this is not array, but integer.