From 26fe001ada956c0ad023ea0e3aa3c7dded3526ad Mon Sep 17 00:00:00 2001
From: Adam Lewis <23342526+Adam-D-Lewis@users.noreply.github.com>
Date: Tue, 10 Jun 2025 02:04:14 -0500
Subject: [PATCH] handle case when alt gr not defined in keyboard layout

---
 lib/pynput/_util/xorg.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/pynput/_util/xorg.py b/lib/pynput/_util/xorg.py
index 52995f3..163d484 100644
--- a/lib/pynput/_util/xorg.py
+++ b/lib/pynput/_util/xorg.py
@@ -95,6 +95,10 @@ def _find_mask(display, symbol):
     modifier_keycode = display.keysym_to_keycode(
         Xlib.XK.string_to_keysym(symbol))
 
+    if modifier_keycode == 0:
+        # No such modifier key defined in the display
+        return 0
+
     for index, keycodes in enumerate(display.get_modifier_mapping()):
         for keycode in keycodes:
             if keycode == modifier_keycode:
@@ -320,8 +324,13 @@ def keyboard_mapping(display):
         if not normalized:
             continue
 
+        group_states = [False, True]
+        if group_mask == 0:
+            # No altgr keysyms, so we can skip this group
+            group_states = [False]
+        
         # Iterate over the groups to extract the shift and modifier state
-        for groups, group in zip(normalized, (False, True)):
+        for groups, group in zip(normalized, group_states):
             for keysym, shift in zip(groups, (False, True)):
                 if not keysym:
                     continue