Something is messing up with PHP

I have bought a gigantic amount of modules in UNA marketplace and now getting ovefull amount of errors in php-fpm log. I cannot figure out which extension|module is screwing up the UNA site.

Before this started happening the UNA 12 was running fine under PHP7.3 and PHP7.4.

Now PHP7.4 throws Error 500, but under PHP7.3 it still runs, but the site is obviously broken and load time is loving line a turtle.

Bellow is an excerpt from my logs. Basically, the same error stack is logged with every page request:

[18-Mar-2021 22:24:17 UTC] PHP Stack trace:
[18-Mar-2021 22:24:17 UTC] PHP   1. {main}() /var/data/web/una/live_updates.php:0
[18-Mar-2021 22:24:17 UTC] PHP   2. BxTemplLiveUpdates->perform() /var/data/web/una/live_updates.php:16
[18-Mar-2021 22:24:17 UTC] PHP   3. BxTemplLiveUpdates->_getRequestedData($iIndex = 61, $bIndexCheck = TRUE, $aCachedData = ['sys_payments_cart' => '0', 'sys_payments_orders' => '0', 'sys_payments_invoices' => '0', 'bx_persons_friend_requests' => '0', 'bx_messenger_new_messages' => '0', 'bx_messenger_public_video_conference' => '0', 'bx_notifications' => '2', 'bx_notifications_toolbar' => '2', 'bx_organizations_friend_requests' => '0', 'aqb_points' => '0', 'msolutions_notify' => '0']) /var/data/web/una/inc/classes/BxDolLiveUpdates.php:121
[18-Mar-2021 22:24:17 UTC] PHP   4. BxTemplLiveUpdates->_getRequestedDataBySystem($aSystem = ['id' => '2', 'name' => 'sys_payments_cart', 'init' => '0', 'frequency' => '1', 'service_call' => 'a:4:{s:6:"module";s:6:"system";s:6:"method";s:21:"get_live_updates_cart";s:6:"params";a:3:{i:0;a:2:{s:11:"menu_object";s:18:"sys_toolbar_member";s:9:"menu_item";s:7:"account";}i:1;a:2:{s:11:"menu_object";s:25:"sys_account_notifications";s:9:"menu_item";s:4:"cart";}i:2;s:7:"{count}";}s:5:"class";s:21:"TemplPaymentsServices";}', 'active' => '1'], $iCachedData = 0, $bInit = FALSE) /var/data/web/una/inc/classes/BxDolLiveUpdates.php:280
[18-Mar-2021 22:24:17 UTC] PHP   5. BxDolService::callSerialized($s = 'a:4:{s:6:"module";s:6:"system";s:6:"method";s:21:"get_live_updates_cart";s:6:"params";a:3:{i:0;a:2:{s:11:"menu_object";s:18:"sys_toolbar_member";s:9:"menu_item";s:7:"account";}i:1;a:2:{s:11:"menu_object";s:25:"sys_account_notifications";s:9:"menu_item";s:4:"cart";}i:2;s:7:"{count}";}s:5:"class";s:21:"TemplPaymentsServices";}', $aMarkers = ['count' => 0, 'init' => 0], $sReplaceIn = *uninitialized*) /var/data/web/una/inc/classes/BxDolLiveUpdates.php:295
[18-Mar-2021 22:24:17 UTC] PHP   6. BxDolService::call($mixed = 'system', $sMethod = 'get_live_updates_cart', $aParams = [0 => ['menu_object' => 'sys_toolbar_member', 'menu_item' => 'account'], 1 => ['menu_object' => 'sys_account_notifications', 'menu_item' => 'cart'], 2 => '0'], $sClass = 'TemplPaymentsServices', $bIgnoreCache = FALSE, $bIgnoreInactive = *uninitialized*) /var/data/web/una/inc/classes/BxDolService.php:82
[18-Mar-2021 22:24:17 UTC] PHP   7. BxDolRequest::processAsService($aModule = ['id' => '2', 'type' => 'module', 'name' => 'system', 'title' => 'System', 'vendor' => 'UNA, Inc', 'version' => '12.0.1', 'help_url' => '', 'path' => '', 'uri' => 'system', 'class_prefix' => 'Bx', 'db_prefix' => 'sys_', 'lang_category' => 'System', 'dependencies' => '', 'date' => '0', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => ''], $sMethod = 'get_live_updates_cart', $aParams = [0 => ['menu_object' => 'sys_toolbar_member', 'menu_item' => 'account'], 1 => ['menu_object' => 'sys_account_notifications', 'menu_item' => 'cart'], 2 => '0'], $sClass = 'TemplPaymentsServices') /var/data/web/una/inc/classes/BxDolService.php:52
[18-Mar-2021 22:24:17 UTC] PHP   8. BxDolRequest::_perform($aModule = ['id' => '2', 'type' => 'module', 'name' => 'system', 'title' => 'System', 'vendor' => 'UNA, Inc', 'version' => '12.0.1', 'help_url' => '', 'path' => '', 'uri' => 'system', 'class_prefix' => 'Bx', 'db_prefix' => 'sys_', 'lang_category' => 'System', 'dependencies' => '', 'date' => '0', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => ''], $sClass = 'TemplPaymentsServices', $sMethod = 'serviceGetLiveUpdatesCart', $aParams = [0 => ['menu_object' => 'sys_toolbar_member', 'menu_item' => 'account'], 1 => ['menu_object' => 'sys_account_notifications', 'menu_item' => 'cart'], 2 => '0'], $bTerminateOnError = FALSE) /var/data/web/una/inc/classes/BxDolRequest.php:57
[18-Mar-2021 22:24:17 UTC] PHP   9. call_user_func_array:{/var/data/web/una/inc/classes/BxDolRequest.php:129}($function_name = [0 => class BxTemplPaymentsServices {  }, 1 => 'serviceGetLiveUpdatesCart'], $parameters = [0 => ['menu_object' => 'sys_toolbar_member', 'menu_item' => 'account'], 1 => ['menu_object' => 'sys_account_notifications', 'menu_item' => 'cart'], 2 => '0']) /var/data/web/una/inc/classes/BxDolRequest.php:129
[18-Mar-2021 22:24:17 UTC] PHP  10. BxTemplPaymentsServices->serviceGetLiveUpdatesCart($aMenuItemParent = ['menu_object' => 'sys_toolbar_member', 'menu_item' => 'account'], $aMenuItemChild = ['menu_object' => 'sys_account_notifications', 'menu_item' => 'cart'], $iCount = '0') /var/data/web/una/inc/classes/BxDolRequest.php:129
[18-Mar-2021 22:24:17 UTC] PHP  11. BxDolPayments->getCartItemsCount() /var/data/web/una/template/scripts/BxBasePaymentsServices.php:92
[18-Mar-2021 22:24:17 UTC] PHP  12. BxDolRequest::serviceExists($mixedModule = 'bx_payment', $sMethod = 'get_cart_items_count', $sClass = 'Cart') /var/data/web/una/inc/classes/BxDolPayments.php:273
[18-Mar-2021 22:24:17 UTC] PHP  13. BxDolRequest::_methodExists($mixedModule = 'bx_payment', $sMethodType = 'service', $sMethodName = 'get_cart_items_count', $sClass = 'Cart') /var/data/web/una/inc/classes/BxDolRequest.php:66
[18-Mar-2021 22:24:17 UTC] PHP  14. BxDolRequest::_require($aModule = ['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => ''], $sClass = 'BxPaymentCart') /var/data/web/una/inc/classes/BxDolRequest.php:166
[18-Mar-2021 22:24:17 UTC] PHP  15. BxPaymentCart->__construct(['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => '']) /var/data/web/una/inc/classes/BxDolRequest.php:151
[18-Mar-2021 22:24:17 UTC] PHP  16. BxPaymentCart->__construct() /var/data/web/una/modules/boonex/payment/classes/BxPaymentCart.php:18
[18-Mar-2021 22:24:17 UTC] PHP  17. BxDolModule::getInstance($sName = 'bx_payment') /var/data/web/una/modules/base/payment/classes/BxBaseModPaymentCart.php:24
[18-Mar-2021 22:24:17 UTC] PHP  18. BxPaymentModule->__construct($aModule = ['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => '']) /var/data/web/una/inc/classes/BxDolModule.php:102
[18-Mar-2021 22:24:17 UTC] PHP  19. BxPaymentModule->__construct($aModule = ['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => '']) /var/data/web/una/modules/boonex/payment/classes/BxPaymentModule.php:114
[18-Mar-2021 22:24:17 UTC] PHP  20. BxPaymentModule->__construct($aModule = ['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => '']) /var/data/web/una/modules/base/payment/classes/BxBaseModPaymentModule.php:18
[18-Mar-2021 22:24:17 UTC] PHP  21. BxPaymentModule->__construct($aModule = ['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => '']) /var/data/web/una/modules/base/general/classes/BxBaseModGeneralModule.php:25
[18-Mar-2021 22:24:17 UTC] PHP  22. BxPaymentConfig->__construct($aModule = ['id' => '29', 'type' => 'module', 'name' => 'bx_payment', 'title' => 'Payment', 'vendor' => 'Boonex', 'version' => '12.0.3', 'help_url' => 'http://feed.una.io/?section={module_name}', 'path' => 'boonex/payment/', 'uri' => 'payment', 'class_prefix' => 'BxPayment', 'db_prefix' => 'bx_payment_', 'lang_category' => 'Payment', 'dependencies' => '', 'date' => '1615434783', 'enabled' => '1', 'pending_uninstall' => '0', 'hash' => '']) /var/data/web/una/inc/classes/BxDolModule.php:63
[18-Mar-2021 22:24:17 UTC] PHP  23. BxPaymentConfig->getBaseUri() /var/data/web/una/modules/boonex/payment/classes/BxPaymentConfig.php:23
[18-Mar-2021 22:24:17 UTC] PHP  24. BxDolPermalinks->permalink($sLink = 'modules/?r=payment/', $aParams = *uninitialized*) /var/data/web/una/inc/classes/BxDolModuleConfig.php:116
[18-Mar-2021 22:24:17 UTC] PHP  25. bx_alert($sUnit = 'system', $sAction = 'permalink', $iObjectId = 0, $iSender = 0, $aExtras = ['link' => 'modules/?r=payment/', 'params' => [], 'return_data' => NULL]) /var/data/web/una/inc/classes/BxDolPermalinks.php:164
[18-Mar-2021 22:24:17 UTC] PHP  26. BxDolAlerts->alert() /var/data/web/una/inc/utils.inc.php:1585
[18-Mar-2021 22:24:17 UTC] PHP Notice:  Undefined offset: 1235 in /var/data/web/una/inc/classes/BxDolAlerts.php on line 110