Cannot iterate over null (null) during Prepare

slightly different stack trace (I did fix this..)

python cloudmapper.py prepare --account XXXXX
Building data for account XXXXX

- 4 nodes built in region us-east-1
- 18 nodes built in region us-east-2
- 0 nodes built in region us-west-1
- 0 nodes built in region us-west-2
Traceback (most recent call last):
File "cloudmapper.py", line 72, in
main()
File "cloudmapper.py", line 66, in main
commands[command].run(arguments)
File "/home/sdunt/Programs/cloudmapper/commands/prepare.py", line 833, in run
prepare(account, config, outputfilter)
File "/home/sdunt/Programs/cloudmapper/commands/prepare.py", line 662, in prepare
cytoscape_json = build_data_structure(account, config, outputfilter)
File "/home/sdunt/Programs/cloudmapper/commands/prepare.py", line 552, in build_data_structure
for c, reasons in get_connections(cidrs, vpc, outputfilter).items():
File "/home/sdunt/Programs/cloudmapper/commands/prepare.py", line 224, in get_connections
for sg in instance.security_groups:
File "/home/sdunt/Programs/cloudmapper/shared/nodes.py", line 574, in security_groups
return pyjq.all(".Groups[].GroupId", self._json_blob)
File "/home/sdunt/Programs/cloudmapper/venv/lib/python3.8/site-packages/pyjq.py", line 49, in all
return compile(script, vars, library_paths).all(_get_value(value, url, opener))
File "_pyjq.pyx", line 209, in _pyjq.Script.all (_pyjq.c:2561)
_pyjq.ScriptRuntimeError: Cannot iterate over null (null)

Running CloudMapper 2.9.1

already patched the requirements.txt for package version conflicts: https://github.com/duo-labs/cloudmapper/pull/876/commits/b5b31ca15077949ade909112e0a6de3b787d2a6b

added the '?' in node.py line 498:
".DBSubnetGroup.Subnets[]**?**.SubnetIdentifier", self._json_blob

To correct this error, I also had to add "?" to node.py line 574:
return pyjq.all(".Groups[]**?**.GroupId", self._json_blob)

After that it works.