Fix commit 1eb03c8c87de9ccd0506ed90c4938240f5eb9fc2

Thanks to Michael Brand for reporting this.

lisp/org.el

@@ -12858,7 +12858,7 @@ This function is run automatically after each state change to a DONE state."
 	 (org-log-done nil)
 	 (org-todo-log-states nil)
 	 re type n what ts time to-state)
-    (when (and repeat (not (zerop (string-to-number repeat))))
+    (when (and repeat (not (zerop (string-to-number (substring repeat 1)))))
       (if (eq org-log-repeat t) (setq org-log-repeat 'state))
       (setq to-state (or (org-entry-get nil "REPEAT_TO_STATE")
 			 org-todo-repeat-to-state))