Василий Наумкин

битрикс требует overload=2

<?php
if ($modx->event->name != 'OnDocFormPrerender' || $resource instanceof Ticket || $resource instanceof TicketsSection) {
    return;
}

if ($Tickets = $modx->getService('Tickets')) {
    $modx->controller->addLexiconTopic('tickets:default');
    
    $Tickets->loadManagerFiles($modx->controller, array(
        'config' => true,
		'utils' => true,
		'css' => true,
		'comments' => true,
    ));
    
    $insert = '
		tabs.add({
			title: _("comments"),
			items: [{
				xtype: "tickets-panel-comments",
				hidden: false,
				record: ' . $modx->toJSON($resource->toArray()) . ',
				parents: ' . $resource->id . ',
			}]
		});
	';
	if ($modx->getCount('modPlugin', array('name' => 'AjaxManager', 'disabled' => false))) {
		$modx->controller->addHtml('
		<script type="text/javascript">
			Ext.onReady(function() {
				window.setTimeout(function() {
					var tabs = Ext.getCmp("modx-resource-tabs");
					if (tabs) {
						' . $insert . '
					}
				}, 10);
			});
		</script>', true);
	}
	else {
		$modx->controller->addHtml('
		<script type="text/javascript">
			Ext.ComponentMgr.onAvailable("modx-resource-tabs", function() {
				var tabs = this;
				tabs.on("beforerender", function() {
					' . $insert . '
				});
			});
		</script>', true);
	}
}

методом исключения, удалять модули и скрипты и проверять.