Persistent error message

Hi,

i have an error message in mailpoet’s admin pages, saying that the mailpoet 2.1.8 update process failed. Clicking on “more details” i read this:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 (UPDATEWMD_wysija_user_listas A set A.sub_date= 1444908737 where A.list_id=;)

That message is present from a long time, even if mailpoet was always updated (current version: 2.6.19)

I was in contact with your support by email before this summer but now i see email support is no more available for free users.

You (Valério) requested a remote access to db but i didn’t found the way to allow you this because of hosting limitations.

Can you tell me how to fix this in db? Thank you.

https://ww.wp.xz.cn/plugins/wysija-newsletters/