bugfix

themis-business/src/main/resources/mapper/TOeExamRecordMapper.xml

@@ -1365,7 +1365,7 @@
             #{roomCode}
         </foreach>
         and (t.STATUS = 'FINISHED'
-        or t.STATUS = 'PERSISTED')
+        or t.STATUS = 'PERSISTED') and t.first_start_time is not null
         union all
         select
         count(distinct t.id) as c