Comment 9 for bug 1528139

I patched aa.py file with standard Ubuntu version (2.10) but error still occurs.

sudo aa-logprof -f /var/log/kern.log
Reading log entries from /var/log/kern.log.
Updating AppArmor profiles in /etc/apparmor.d.
Traceback (most recent call last):
  File "/usr/sbin/aa-logprof", line 50, in <module>
    apparmor.do_logprof_pass(logmark)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 2176, in do_logprof_pass
    log = log_reader.read_log(logmark)
  File "/usr/lib/python3/dist-packages/apparmor/logparser.py", line 358, in read_log
    self.add_event_to_tree(event)
  File "/usr/lib/python3/dist-packages/apparmor/logparser.py", line 263, in add_event_to_tree
    rmask = rmask.replace('c', 'a')
AttributeError: 'NoneType' object has no attribute 'replace'

An unexpected error occoured!

For details, see /tmp/apparmor-bugreport-s93jfr8t.txt
Please consider reporting a bug at https://bugs.launchpad.net/apparmor/
and attach this file.

I send you kern.log file on email.
I noticed that sometimes aa-logprof doesn't see denied messages in logfile.