A new version for the Zoo plugin has been released. This version is 1.3.1.
The main improvement this version offers is the possibility to filter the results by a specific type of listing, which wasn't considered previously and caused some empty results in some cases.
Now, on the "Extra filters" field of the module parameters you can specify the type of listing you want to consider, with this syntax:
The value must be a type existing on your Zoo installation. If no type is specified, "article" will be used (which is the default option in Zoo).
Check this screenshot for a better understanding: