PhpMyAdmin The session id is too long and Session object destruction failed Warning Messages

Here are the full warning messages:

Warning in .\libraries\session.inc.php#101 session_start(): The session id is too long or contains illegal characters, valid
characters are a-z, A-Z, 0-9 and '-,'

Backtrace

.\libraries\session.inc.php#101: session_start()
.\libraries\common.inc.php#352: require(.\libraries\session.inc.php)
.\index.php#12: require_once(.\libraries\common.inc.php)

and

Warning in .\libraries\session.inc.php#122 session_regenerate_id(): Session object destruction failed

Backtrace

.\libraries\session.inc.php#122: session_regenerate_id(boolean true)
.\libraries\common.inc.php#872: PMA_secureSession() .\index.php#12:
require_once(.\libraries\common.inc.php)

Got these errors on my PMA login page. Here's a screenshot:

The last time I logged in was 3 days ago and it was working fine. Now, after several times of attempting to log in (I have a password, by the way), I just can't. I didn't change anything in my PMA files at all.

Help, anyone?