diff -u /home/user/downloads/opt_clone/emacs/lisp/ses.el /home/user/downloads/opt_clone/emacs/lisp/ses.el.bak
--- /home/user/downloads/opt_clone/emacs/lisp/ses.el	2022-02-19 16:12:38.757109243 +0000
+++ /home/user/downloads/opt_clone/emacs/lisp/ses.el.bak	2022-03-08 04:28:00.653553511 +0000
@@ -2245,8 +2245,8 @@
 					       ses--named-cell-hashmap)
 				      names)))))
 		 (if (string= s "")
-		     (user-error "Invalid cell name")
-		   (list (intern s)))))
+		     (user-error "Empty cell name")
+		   (list (intern (upcase s))))))
   (let ((rowcol (ses-sym-rowcol sym)))
     (or rowcol (error "Invalid cell name"))
     (if (eq (symbol-value sym) '*skip*)

Diff finished.  Tue Mar  8 04:28:36 2022