When trying to sort Tests in TestPlan issue, by requirement, we get an exception

An error occurred while processing table data
Internal Server Error: {"message":"Comparison method violates its general contract!","status-code":500,"stack-trace":"java.lang.IllegalArgumentException: Comparison method violates its general contract!\n\tat java.util.TimSort.mergeLo(TimSort.java:777)\n\tat java.util.TimSort.mergeAt(TimSort.java:514)\n\tat java.util.TimSort.mergeCollapse(TimSort.java:441)\n\tat java.util.TimSort.sort(TimSort.java:245)\n\tat java.util.Arrays.sort(Arrays.java:1512)\n\tat java.util.ArrayList.sort(ArrayList.java:1454)\n\tat java.util.Collections.sort(Collections.java:175)\n\tat com.xpandit.raven.datatable.p.a(Unknown Source)\n\tat