Copy of script create error

[kozakromch]

Hello, thanks for the great theme, I found the error that I can't fix.
Steps to reproduce
Create two posts one is empty and other with script like that

Than from left bar go to first and go to second post. After loading second post with script console show the error

If you load this page from the begining you will not see this page. If you use var instead const there will be no error, but this error prevent me to use modules and I can't optimize pages for parallel loading. Can you please help me? Thanks in advance)