I realize no that this massage only popped up because debugging mode was enabled. With debugging disabled I do not see the error message in the frontend anymore. Would be good to know what it caused it though.
I have one more question concerning the heading – when I enable Heading Title with backgound, the uppercase is reset to normal style again, what do I have to change in the code in order to work for Heading Title with backgound as well? And could I change the color theme from light to dark when I have a light background?
