Hi how can I fix this problem?  
спасибо!!!

IPS\Db\Exception: Table 'performance_schema.session_variables' doesn't exist (1146)
#0 /var/www/forum/system/Helpers/Form/Editor.php(161): IPS\_Db->query('SHOW VARIABLES ...')
#1 /var/www/forum/system/CustomField/CustomField.php(754): IPS\Helpers\Form\_Editor->__construct('core_pfield_1', NULL, 0, Array, NULL, NULL, NULL, 'core_pfield_1_e...')
#2 /var/www/forum/applications/core/sources/ProfileFields/Field.php(197): IPS\_CustomField->buildHelper(NULL)
#3 /var/www/forum/applications/core/modules/admin/members/members.php(63): IPS\core\ProfileFields\_Field::fields(Array, 2)
#4 /var/www/forum/system/Dispatcher/Controller.php(96): IPS\core\modules\admin\members\_members->manage()
#5 /var/www/forum/system/Dispatcher/Dispatcher.php(146): IPS\Dispatcher\_Controller->execute()
#6 /var/www/forum/admin/index.php(14): IPS\_Dispatcher->run()
#7 {main}

I have this same error since version 4.4.8, if I remember correctly.

Haven't found a solution yet.

Anyhow this table seems to be parts of MySQL database and not the database of the Invision Community installation.

I'm using MySQL v. 5.7.31 and since I updated to this version I got this issue, and cannot downgrade or upgrade to a newer version.