Campaign Chart is not showing.

Hello guys,

i got a problem with the Status site of the Campaigns.
If I open the page this fatal error is coming:

Fatal error: Uncaught Error: Call to a member function getXMLFileName() on null in
CRM/modules/Campaigns/Charts.php:72 Stack trace: #0
/CRM/modules/Campaigns/TrackDetailView.php(221): campaign_charts->campaign_response_by_activity_type(Array, Array, ‘c5de21a2-4851-d…’, ‘cache/xml/e6050…’, true) #1
CRM/include/MVC/View/SugarView.php(834): include_once(’/homepages/2/d7…’) #2
CRM/modules/Campaigns/views/view.classic.php(78): SugarView->includeClassicFile(‘modules/Campaig…’) #3
CRM/include/MVC/View/SugarView.php(226): CampaignsViewClassic->display() #4
CRM/include/MVC/Controller/SugarController.php(435): SugarView->process() #5
CRM/include/MVC/Controller/SugarController.php(375): SugarController->proces in
CRM/modules/Campaigns/Charts.php on line 72

I think the CRM is not knowing which Campaign ID it should use because in line 72 is following line:

$xmlFile = $sugarChart->getXMLFileName($campaign_id);

But im not sure where I can change the ID or the reference

Can you maybe help me??