Gregor Zattler <telegraph@gmx.net> writes:

> Dear org-mode developers, Ihor, I got these warnings
> immediately after I purged ~/.cache/org-persist, started
> emacs/org-mode and tried to find some node via org-rifle.
> Backtrace:
>   org-element-cache diagnostics( *helm-org-rifle-fontify*): nil is about to modify text: warning t
>   org-element-cache diagnostics( *helm-org-rifle-fontify*): nil is about to modify text: warning t
> ...

Thanks for reporting! The backtrace is very helpful.

Can you please try the attached patch and let me know if it helps?

Best,
Ihor