Here is the original discussion we disscusses.
https://github.com/jkitchin/org-ref/issues/433
And Here is the patch:
#+BEGIN_SRC diff
modified lisp/org.el
@@ -9730,7 +9730,7 @@ active region."
(setq sfuns
(delq
nil (mapcar (lambda (f)
- (let (fs) (if (funcall f) (push f fs))))
+ (let (fs) (if (and (stringp f) (funcall f)) (push f fs))))
(org-store-link-functions)))
sfunsn (mapcar (lambda (fu) (symbol-name (car fu))) sfuns))
(or (and (cdr sfuns)
#+END_SRC
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