Yes, I did. In a first run, after the first successful bunch of migration, I choosed one empty (big container) category with a subcategory with 128 articles inside. The plugin migrated the two categories, then prompter that message. On investigation, I found it migrated also one (1) article of those 128.
On further attempts, nothing more migrated, I get always that message [0 count(): Argument #1 ($value) must be of type Countable|array, stdClass given].
