Mailman find member search returns 2.2.0 error message

Symptoms

Entering a search via "Find Member" failed with an error.

This error is related to the following traceback in the Mailman error log file, located at path "/usr/local/cpanel/3rdparty/mailman/logs/error".

admin(5119):    File "/usr/local/cpanel/3rdparty/mailman/Mailman/Cgi/admin.py", line 963, in membership_options
all = [a for n, a in zip(names, all)
admin(5119):    File "/usr/local/cpanel/3rdparty/mailman/Mailman/Cgi/admin.py", line 964, in <listcomp>
if cre.search(n) or cre.search(a)]
admin(5119):  TypeError: cannot use a string pattern on a bytes-like object

Description

The member search option in the Mailman list is returning an error from what appears to be an issue with some users in the list. It is unclear why this is occurring, but we suspect it may be related to the update from Python version 2 to 3 in Mailman.

We've opened an internal case for our development team to investigate this further. For reference, the case number is CPANEL-49635. Follow this article to receive an email notification when a solution is published in the product. 

Workaround

Unknown at this time.