Hello. I have a problem with the Sp Page Builder element (please see photo no. 1 below). When I add this add-on or copy it and save it on the page, it displays correctly, but when I change something in this add-on, e.g. add/change the url address or a photo, an error immediately appears on the front page "Object of class stdClass could not be converted to string" (please see photo no. 2 below).
Foto 1

Foto 2

Please help me solve the problem.
Best regards, Michał.