Started getting this error on multiple sites now when there is a button present but only if the button is edited (ie existing ones untouched don't seem to trigger the error):
Recoverable fatal error: Object of class stdClass could not be converted to string in /path-to-site-on-server/www/mywebsite.com/public_html/components/com_sppagebuilder/addons/button/site.php on line 25