Hello,

for(PermissionUser pu : PermissionsEx.getPermissionManager().getUsers()){
                    pu.setPrefix(null, null);
}

Doesn't work, why?

[PermissionsEx] version [1.23.4]
Spigot 1.8.9 with protocolhack.

The prefix was set from a group maybe? You have to change groups too.

It works now, but server crashes if I run it twice. What's the problem? Btw how to remove all users from different groups? But leave their suffix and own permissions. @zml2008

[16:18:04 INFO]: WEPIF: PermissionsEx detected! Using PermissionsEx for permissions.
[16:18:34 WARN]: [PermissionsEx] All backend tasks not completed after 30 seconds, waiting 2 minutes.