okay, suspect you've run into the 1.1.9 to 1.2.0 updating issue of the prefix on your db not being ac_
A lot of us, including me didn't know that until we encountered issues.
Hope you made a Softaculous backup of your 1.1.9 before running the update. I like to clone my working site within Softaculous, try my updates and see what happens before running on my production sites. Also, I always use the Softaculous backup IMMEDIATELY before I update the production site so I can roll back instantly if I have a failure. Just hints if things I have found along the way that keep me running.
Okay now to the DB issue - you need to change the prefix on your db to ac_ PRIOR to running the 1.2.0 update
It is easy to do. Using myPhpAdmin go into the db of the site you are intending to update (be sure it is the one associated with the site you are working on)
I am attaching a screen shot so you can see the steps in getting the prefix changed.
You need to change it to ac_ for all tables (not the DB, but the tables in the DB)
You will probably need to refresh your browser screen to see that the prefix is now ac_
THEN THIS IS IMPORTANT: you need to go into the /public_html/(if you are in dir)/system/config.php
and change the line for the prefix to the ac_
define('DB_DATABASE', 'abcext_store');
define('DB_PREFIX', 'ac_');
// Unique AbanteCart store ID