image-copy-extension

'NoneType' object is not subscriptable

Getting os disk id of the source vm/image
'NoneType' object is not subscriptable
Traceback (most recent call last):
File "/opt/az/lib/python3.6/site-packages/knack/cli.py", line 194, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/init.py", line 342, in execute
six.reraise(*sys.exc_info())
File "/opt/az/lib/python3.6/site-packages/six.py", line 693, in reraise
raise value
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/init.py", line 315, in execute
result = cmd(params)
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/init.py", line 175, in call
return super(AzCliCommand, self).call(*args, **kwargs)
File "/opt/az/lib/python3.6/site-packages/knack/commands.py", line 109, in call
return self.handler(*args, **kwargs)
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/init.py", line 349, in default_command_handler
result = op(**command_args)
File "/home/Wolfthorne/.azure/cliextensions/image-copy-extension/azext_imagecopy/custom.py", line 27, in imagecopy
source_os_disk_id = json_cmd_output['storageProfile']['osDisk']['managedDisk']['id']
TypeError: 'NoneType' object is not subscriptable