After upgrading (first) to Joomla 3.7.0 and (second) to JEvents 3.4.34 a previously working menu link to JEvents (month view: index.php?option=com_jevents&view=month&layout=calendar) produces an error: "0 - Cannot assign by reference to overloaded object".
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