= Bug Description =
Approving a pending mailing list subscription request in a list that is open results in a server error.
= Bug Analysis =
This specific error is triggered when approving a pending member on the email@example.com mailing list who is:
= Fix Recommendation =
If this is a problem with a user subscribing in a time while a list requires approval to join, but joins after it is opened, approving the member should return a message that the user is already subscribed and then remove the pending request instead of returning an error.
I have reproduced the error and forwarded this bug upstream as https://gitlab.com/mailman/mailman/issues/193.
Thanks a lot for reporting.
The bug has been fixed upstream and will be deployed with the next push. Thanks again.
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