TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

[satyendra22]

When select "scan" and "host" report type then its thrown below error

Traceback (most recent call last):
File "C:\Satya\tools\nessus-file-analyzer\nessus_file_analyzer\app.py", line 1383, in create_worksheet_for_scans
policy_max_hosts = int(nfr.scan.policy_max_hosts(root))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
Traceback (most recent call last):
File "C:\Satya\tools\nessus-file-analyzer\nessus_file_analyzer\app.py", line 1720, in create_worksheet_for_hosts
policy_max_hosts = int(nfr.scan.policy_max_hosts(root))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'