I'm checking this issue. I tried adding the icon to menu on the T4 Blank template but not getting the same error as yours. I have backed up your website to test on my localhost. I will get back to you as soon as possible.
I've tried adding the icon to menu on my localhost and it was working fine.
Can you edit your original post and provide me with your website url and the back-end account login. I'll be able to check further and find a solution for you then.
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