2 Minor issues (confirmation & unsub)

Hey there,

first of all: Thank you for this great software!

Installation, Mailing and all the other features are great and work perfectly!
We plan on purchasing the full version if we get everything runnning.

My two minor issues:

subscription confirmation
When I click the link in the Mail, I get this message

"An error has occurred. For more details please view "logs/errors.log"."

The error log shows the following:

Error Code: 8 Undefined index: joined
Date/Time: 11 July 2019 @ 11:10AM
Error on line 1050 in file /www/xxxxxxxx/kleinundfein-design/responder/signup.php 


Error Code: 2 Cannot modify header information - headers already sent by (output started at /www/xxxxxxxxx/kleinundfein-design/responder/control/classes/class.errors.php:117)
Date/Time: 11 July 2019 @ 11:10AM
Error on line 1231 in file /www/xxxxxxxxx/kleinundfein-design/responder/signup.php 

I haven't modified any of these to files, so no idea.

unsub doesn't work
As another user in this forum posted:
The unsub link from the mail works, but unsubcribing doesnt.
After getting send to this URL "responder//unsub.php?e=-1" this message occurs:
"Great news - We cannot find your email address in our system, so perhaps you have already unsubscribed."

And the user is still in the mailing list.

I tried Unsubscribe Preference "Single Campaign and all campaign". Nothing works.

All help is greatly appreciated!