users.php error and others

Hi,

for almost a year my users.php page does not work, it gives 500 Internal Server Error and shows nothing, and I guess it is related to your plugin.

I have started tests and troubleshooting and I have experienced the followings:

Originally my users had Customer role.

After I had been started to use your plugin all the new users become Private User role (this role is created with your plugin). Half of the users are Customer others are Private User now.

Although users.php does not work, I can list my users successfully by narrowing the list to a specific role:

https://www.pplkonyv.hu/wp-admin/users.php?role=customer

https://www.pplkonyv.hu/wp-admin/users.php?role=private_user

I wanted to change all Customer to Private User, I bulk selected all Customer and added them Private User role using the feature of your plugin (Add button). The results are:

1.
After that not just users.php gives an error, but the list of Private User page too, I mean this:
https://www.pplkonyv.hu/wp-admin/users.php?role=private_user

2.
Actually the role of the Customers did not change to Private User (I checked it at their user profile page).

3.
If I undo this bulk role change by bulk revoke Private User role, then I can list successfully Private Users again (but users.php still does not work).

4.
Eventually I can change the role of the user to any role one-by-one at their user profile page.

Are you familiar with this issue? Can you help me out here, please?

Bests,

András Fábián