SQL error in Detailed statistics report of Hotpot module

1. Created a new JCross hotpot activity
2. Completed the activity with one student
3. As a teacher, attempted to generate a report with the following params:
a. Detailed statistic
b. Enrolled students (I have separate groups set up for this course)
c. Best attempt
d. Format: HTML
e. Wrap data: yes
f. Show legend: no

This error does not occur if I select "All users" or "All participants":

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') GROUP BY clickreportid' at line 1

SELECT clickreportid, MAX(CONCAT(timefinish,'_',id)) AS joinedvalues FROM mdl_hotpot_attempts a WHERE a.clickreportid IN () GROUP BY clickreportid

• line 686 of lib\dmllib.php: call to debugging()
• line 944 of lib\dmllib.php: call to get_recordset_sql()
• line 654 of mod\hotpot\report.php: call to get_records_sql()
• line 204 of mod\hotpot\report.php: call to hotpot_get_records_groupby()