After enabling debugging, I get this addiional information:
Call stack
# Function Location
1 require_once() JROOT/libraries/cms/component/helper.php:394
2 JComponentHelper::executeComponent() JROOT/libraries/cms/component/helper.php:369
3 JComponentHelper::renderComponent() JROOT/libraries/cms/application/site.php:191
4 JApplicationSite->dispatch() JROOT/libraries/cms/application/site.php:230
5 JApplicationSite->doExecute() JROOT/libraries/cms/application/cms.php:265
6 JApplicationCms->execute() JROOT/index.php:49