Define variable

lisp/org.el

@@ -15552,7 +15552,7 @@ BEG and END default to the buffer boundaries."
       (let ((re (concat "\\[\\[\\(\\(file:\\)\\|\\([./~]\\)\\)\\([-+~./_0-9a-zA-Z]+"
 			(substring (org-image-file-name-regexp) 0 -2)
 			"\\)\\]" (if include-linked "" "\\]")))
-	    file ov img)
+	    old file ov img)
 	(while (re-search-forward re end t)
 	  (setq old (get-char-property-and-overlay (match-beginning 1)
 						   'org-image-overlay))