diff --git a/config.org b/config.org
index 4555669..b677b12 100644
--- a/config.org
+++ b/config.org
@@ -2474,8 +2474,9 @@ If prefix ARG is given, delete the window instead of selecting it." n)
   "Jump to popup window 0, or popup 10 if 0 is not assigned.
 If prefix ARG is given, delete the window instead of selecting it."
   (interactive "P")
-  (let ((n (if (winum-get-window-by-index '(popup . 0))
-               '(popup . 0) '(popup . 10))))
+  (let ((n (or (and (winum-get-window-by-index '(popup . 0)) '(popup . 0))
+               (and (winum-get-window-by-index '(popup . 10)) '(popup . 10))
+               (user-error "No window with index (popup . 0) or (popup . 10)"))))
     (if arg
         (winum-delete-window-by-index n)
       (winum-select-window-by-index n))))
diff --git a/pkgs/winum b/pkgs/winum
index efa0aed..6094bb0 160000
--- a/pkgs/winum
+++ b/pkgs/winum
@@ -1 +1 @@
-Subproject commit efa0aedb7c4c03fb287210cd248f5fad8d4442c9
+Subproject commit 6094bb05f3a78687529b55674dbdd697e51e1c25