Migration stopped working after v3.1.11

Hi,

My project is using Migration library to create and update table structures.
Until version 3.1.10 everything worked fine. i use cli to execute the migration:

`php index.php migrate_controller up`

This works in version 3.1.9, 3.1.10 but not not 3.1.11.

After swapping the system folder the following error presented itself:

CLI returns following error:

Database error: A Database Error Occurred

Error Number: 42000/1102
Incorrect database name ''
SHOW TABLES FROM ``
Filename: libraries/Migration.php
Line Number: 167

At first glance the libraries look identical... yet it does not work in 3.1.11 when i replace the system folder with the 3.1.10 / 3.1.9 it's up and running again ...

I've been searching for where it's going wrong for over 3 hours now but can't seem to locate the issue ...

Am i overlooking something or is it a bug.

Thanks in advance,

Bart