MySQL data not available (N/A)

Hello!

One of our clients has an issue regarding MySQL summary data shown in CPanel (see: attached picture). What could be the cause of that?

We have over 800 registered CPanel accounts, but he's the only one that has this kind of problem. He doesn't see his MySQL summary data, nor can he create MySQL databases/users (almost blank page, no forms, no list of databases/users).