diff --git a/nodebox/graphics/context.py b/nodebox/graphics/context.py
index 2be4d1e..638698e 100644
--- a/nodebox/graphics/context.py
+++ b/nodebox/graphics/context.py
@@ -3811,7 +3811,10 @@ def _on_key_release(self, keycode, modifiers):
             layer.on_key_release(self.key)
         self.on_key_release(self.key)
         self._keys.char = ""
-        self._keys.remove(keycode)
+        try:
+            self._keys.remove(keycode)
+        except ValueError:
+            pass
         self._keys.pressed = False
 
     def _on_text(self, text):