When use the eval.py script, I met this problem. I want to know how to sovle it ,thanks!

[QvQKing]

Traceback (most recent call last):
File "/mnt/datadisk/lwj/gSDF-master/tools/eval.py", line 241, in
main()
File "/mnt/datadisk/lwj/gSDF-master/tools/eval.py", line 198, in main
summary_obj = sorted(summary_obj, reverse=False, key=lambda result: result[1])
TypeError: '>' not supported between instances of 'float' and 'NoneType'