Issues with type of database during an upgrade

[papakota]

Hello!
I have Joomla 3.8.6 and I wanted to upgrade VM from version 3.2.12 to the latest one - 3.2.14 But during an upgrade I got an error. From what I understood, it had something to do with MySQL db of Joomla. I had switched it to MySQLi and after that the upgrade went smooth. After all of the above, I checked everything and it looked like it worked fine. What was it? Could you explain, please?

[Milbo]

We had more and more users with strange problems. They used the PDO driver instead. So we added this check.