Something completely unrelated I was working on a test db.
Anyway if you prune members via the ACP member search and they have tutorials, at least I 'think' that was it, the following is thrown:
Kanał Rss
Kanał AtomFatal error: Uncaught exception 'Exception' with message 'tutStandard is not an object' in ***\admin\sources\base\ipsRegistry.php:967 Stack trace: #0 ***\admin\sources\base\ipsRegistry.php(1060): ipsRegistry::getClass('tutStandard') #1 ***\admin\applications_addon\other\tutorials\sources\moderate.php(96): ipsRegistry->__get('tutStandard') #2 ***\admin\applications_addon\other\tutorials\extensions\memberSync.php(44): moderate->deleteArticle(Array) #3 ***\admin\sources\base\core.php(2260): tutorialsMemberSync->onDelete(' IN (1,5,8,490,...') #4 ***\admin\sources\base\core.php(7153): IPSLib::runMemberSync(Array, Array) #5 ***\admin\applications\members\modules_admin\members\members.php(1586): IPSMember::remove('onDelete', ' IN (1,5,8,490,...') #6 ***\admin\applications\members\modules_admin\members\members.php(112): admin_members_members_members->_memberDoPrune(Array, true) #7 in ***\admin\sources\base\ipsRegistry.php on line 967