diff --git a/crates/gpui/src/keymap.rs b/crates/gpui/src/keymap.rs
index c408c98960..5d000081cf 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,