From 9d035d713ee2692ea095dc6e0668ecabeb550845 Mon Sep 17 00:00:00 2001
From: Sergey Trofimov <sarg@sarg.org.ru>
Date: Sat, 25 Nov 2023 15:20:36 +0100
Subject: [PATCH] Detect unavailable keys properly. Fixes #592.

---
 exwm-input.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/exwm-input.el b/exwm-input.el
index 05b0210..ae6a4ce 100644
--- a/exwm-input.el
+++ b/exwm-input.el
@@ -514,7 +514,7 @@ ARGS are additional arguments to CALLBACK."
         keysyms keycode alt-modifier)
     (dolist (k exwm-input--global-prefix-keys)
       (setq keysyms (xcb:keysyms:event->keysyms exwm--connection k))
-      (if (not keysyms)
+      (if (= 0 (caar keysyms))
           (warn "Key unavailable: %s" (key-description (vector k)))
         (setq keycode (xcb:keysyms:keysym->keycode exwm--connection
                                                    (caar keysyms)))