I had a smiliar problem where tons of error messages were appearing on Phpmyadmin everytime i clicked somewhere, even after i dismissed them all, they would just appear again every time i clicked on something. Crippling my work flow.

i added the following line in the config.inc.php file and that fixed the problem. I couldn't just remove the "//" before it since it wasnt in the file initially.

the line i added:

$cfg['SendErrorReports'] = 'never';

Since i can't upvote yet i needed to answer here.

Credit to @Rbbn for the answer that helped me too.