```
Traceback (most recent call last):
File "/usr/bin/netbox_agent", line 33, in <module>
sys.exit(load_entry_point('netbox-agent==0.7.1', 'console_scripts', 'netbox_agent')())
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/cli.py", line 50, in main
return run(config)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/cli.py", line 43, in run
server.netbox_create_or_update(config)
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/server.py", line 417, in netbox_create_or_update
self.inventory.create_or_update()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 550, in create_or_update
self.do_netbox_disks()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 420, in do_netbox_disks
disks = self.get_hw_disks()
File "/opt/netbox-agent/lib/python3.6/site-packages/netbox_agent/inventory.py", line 344, in get_hw_disks
size = int(disk.get('size', 0))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
```
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