diff --git a/packages/core/shortcuts/definitions.test.ts b/packages/core/shortcuts/definitions.test.ts
index 7fb7e5d9d..d01f2c5de 100644
--- a/packages/core/shortcuts/definitions.test.ts
+++ b/packages/core/shortcuts/definitions.test.ts
@@ -98,6 +98,14 @@ describe("keyboard shortcut definitions", () => {
     expect(shortcutMatchesEvent(null, keyEvent(key, modifiers), "macos")).toBe(false);
   });
 
+  it("ignores synthetic events without a key, such as Chrome autofill", () => {
+    const event = keyEvent(undefined as unknown as string, { metaKey: true });
+    expect(shortcutFromEvent(event, "macos")).toBeNull();
+    expect(
+      shortcutMatchesEvent(createShortcutChord("K", { primary: true }), event, "macos"),
+    ).toBe(false);
+  });
+
   it("formats the same semantic binding for each platform", () => {
     const shortcut = createShortcutChord("Enter", { primary: true });
     expect(formatShortcut(shortcut, "macos")).toBe("⌘↵");
diff --git a/packages/core/shortcuts/definitions.ts b/packages/core/shortcuts/definitions.ts
index 10bdb69ed..2598808f2 100644
--- a/packages/core/shortcuts/definitions.ts
+++ b/packages/core/shortcuts/definitions.ts
@@ -114,6 +114,8 @@ const KEY_LABELS: Record<string, string> = {
 };
 
 function eventKey(event: KeyboardEvent): string | null {
+  // Synthetic events (e.g. Chrome autofill) may omit `key` entirely.
+  if (typeof event.key !== "string") return null;
   if (MODIFIER_KEYS.has(event.key) || NON_ACTIONABLE_KEYS.has(event.key)) return null;
   const key = KEY_LABELS[event.key] ?? event.key;
   if (key.length === 1 && /[a-z]/i.test(key)) return key.toUpperCase();