diff --git a/crates/gpui/src/keymap.rs b/crates/gpui/src/keymap.rs
index c408c9896049b6128581e8873efd4ba354297443..5d000081cffdac7b1061e5abc9d7e30889a5dd48 100644
--- a/crates/gpui/src/keymap.rs
+++ b/crates/gpui/src/keymap.rs
@@ -301,6 +301,10 @@ impl Keystroke {
             }
         }
 
+        if key.is_none() {
+            return Err(anyhow!("Invalid keystroke `{}`", source));
+        }
+
         Ok(Keystroke {
             ctrl,
             alt,