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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