Error when adding a reviewer

Hi,

We are using OJS 3.1.2.1, which worked fine until recently. Now suddenly we can not add a reviewer to a review. When clicking ‘Add reviewer’ on submission just empty modal window appears:
Screen Shot 2021-03-23 at 10.53.37

Actually, it looks like the whole window appears for a moment, a very short blink and then only the above window stays on.
Clicking ‘Create New Reviewer’ or ‘Enroll Existing User’ work normally.

There is the following error in the console:
Screen Shot 2021-03-23 at 10.57.34

I tried with templates and data cache clearing, new incognito window (so no local caching) - all the same.

Any idea how to solve this or at least investigate further?

Regards, Primož

Hi,

found the root cause and solved the issue. I was thinking about the problem is in JS and frontend somewhere.
But the problem was that the provider changed the PHP extension mysqli to nd_mysqli and that caused the problems. Looks like the change caused a change in the encoding that caused problems. When switching back to the mysqli the issues are solved.

Regards, Primož