Query run with a ptset is errorin gout on rerun

drag and drop a workplace folder containing a ptset onto the query tool and run the query
After query run , drag and drop the previous query onto the querytool name box and rerun the query.
Expected result:query run successful
Acutal result: query run is erroring out
<item>
<item_key>patient_set_coll_id::3244</item_key>
<item_name>undefined</item_name>
<tooltip>undefined</tooltip>
<item_is_synonym>false</item_is_synonym>
<hlevel>0</hlevel>
</item>