diff --git a/packages/command-palette/src/__tests__/command-palette.test.tsx b/packages/command-palette/src/__tests__/command-palette.test.tsx
index 84e1a5bf..e0f3d0e4 100644
--- a/packages/command-palette/src/__tests__/command-palette.test.tsx
+++ b/packages/command-palette/src/__tests__/command-palette.test.tsx
@@ -85,7 +85,7 @@ describe('CommandRegistryProvider', () => {
         ]);
         return useCommands();
       },
-      { wrapper: wrapper() },
+      { wrapper: wrapper() }
     );
     expect(result.current.map(c => c.id).sort()).toEqual(['temp', 'temp2']);
     unmount();
@@ -96,9 +96,7 @@ describe('CommandRegistryProvider', () => {
   });
 
   it('throws when used outside provider', () => {
-    expect(() => renderHook(() => useCommands())).toThrow(
-      /CommandRegistryProvider/,
-    );
+    expect(() => renderHook(() => useCommands())).toThrow(/CommandRegistryProvider/);
   });
 });
 
@@ -128,7 +126,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open={false} onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     expect(screen.queryByTestId('bl-cmdk')).toBeNull();
   });
@@ -137,7 +135,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     expect(screen.getByTestId('bl-cmdk-panel')).toBeDefined();
     expect(screen.getByTestId('bl-cmdk-item-new-task')).toBeDefined();
@@ -149,7 +147,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     expect(screen.queryByTestId('bl-cmdk-item-gated')).toBeNull();
   });
@@ -158,7 +156,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     const dialog = screen.getByTestId('bl-cmdk');
     fireEvent.keyDown(dialog, { key: 'Tab' });
@@ -171,7 +169,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     fireEvent.change(screen.getByTestId('bl-cmdk-input'), {
       target: { value: 'task' },
@@ -184,10 +182,10 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={onClose} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     fireEvent.keyDown(screen.getByTestId('bl-cmdk'), { key: 'Enter' });
-    expect((seed[0].run as ReturnType<typeof vi.fn>)).toHaveBeenCalledOnce();
+    expect(seed[0].run as ReturnType<typeof vi.fn>).toHaveBeenCalledOnce();
     expect(onClose).toHaveBeenCalled();
   });
 
@@ -197,7 +195,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={onClose} onNavigate={onNavigate} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     fireEvent.keyDown(screen.getByTestId('bl-cmdk'), { key: 'Tab' });
     fireEvent.keyDown(screen.getByTestId('bl-cmdk'), { key: 'Enter' });
@@ -209,7 +207,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     const dialog = screen.getByTestId('bl-cmdk');
     fireEvent.keyDown(dialog, { key: 'ArrowDown' });
@@ -225,7 +223,7 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={onClose} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     fireEvent.keyDown(document, { key: 'Escape' });
     expect(onClose).toHaveBeenCalledOnce();
@@ -235,7 +233,7 @@ describe('CommandPalette', () => {
     const { rerender } = render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} initialMode="ask-ai" />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     expect(screen.getByTestId('bl-cmdk-ask-ai')).toBeDefined();
 
@@ -247,7 +245,7 @@ describe('CommandPalette', () => {
           initialMode="ask-ai"
           askAiPanel={q => <div data-testid="custom-ai">{q || 'idle'}</div>}
         />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     expect(screen.getByTestId('custom-ai').textContent).toBe('idle');
   });
@@ -256,12 +254,12 @@ describe('CommandPalette', () => {
     render(
       <CommandRegistryProvider initial={seed}>
         <CommandPalette open onClose={() => {}} />
-      </CommandRegistryProvider>,
+      </CommandRegistryProvider>
     );
     const row = screen.getByTestId('bl-cmdk-item-archive');
     expect(row.getAttribute('aria-disabled')).toBe('true');
     fireEvent.click(row);
-    expect((seed[3].run as ReturnType<typeof vi.fn>)).not.toHaveBeenCalled();
+    expect(seed[3].run as ReturnType<typeof vi.fn>).not.toHaveBeenCalled();
   });
 
   it('recents persist to localStorage when a command is run', () => {
@@ -294,7 +292,7 @@ describe('CommandPalette', () => {
       render(
         <CommandRegistryProvider initial={seed}>
           <CommandPalette open onClose={() => {}} />
-        </CommandRegistryProvider>,
+        </CommandRegistryProvider>
       );
       fireEvent.click(screen.getByTestId('bl-cmdk-item-new-task'));
       expect(mem['bl-cmdk-recents']).toContain('new-task');
@@ -315,16 +313,12 @@ describe('useCommandPalette', () => {
     expect(result.current.open).toBe(false);
 
     act(() => {
-      window.dispatchEvent(
-        new KeyboardEvent('keydown', { key: 'k', metaKey: true }),
-      );
+      window.dispatchEvent(new KeyboardEvent('keydown', { key: 'k', metaKey: true }));
     });
     expect(result.current.open).toBe(true);
 
     act(() => {
-      window.dispatchEvent(
-        new KeyboardEvent('keydown', { key: 'k', metaKey: true }),
-      );
+      window.dispatchEvent(new KeyboardEvent('keydown', { key: 'k', metaKey: true }));
     });
     expect(result.current.open).toBe(false);
 
@@ -335,6 +329,19 @@ describe('useCommandPalette', () => {
     expect(result.current.open).toBe(false);
   });
 
+  it('ignores keydown events with an undefined key (autofill/IME) without throwing', () => {
+    const { result } = renderHook(() => useCommandPalette());
+    expect(() =>
+      act(() => {
+        // Some events (autofill, IME) dispatch keydown with no `key` set.
+        const ev = new KeyboardEvent('keydown', { metaKey: true });
+        Object.defineProperty(ev, 'key', { value: undefined });
+        window.dispatchEvent(ev);
+      })
+    ).not.toThrow();
+    expect(result.current.open).toBe(false);
+  });
+
   it('show/hide/toggle imperative helpers', () => {
     const { result } = renderHook(() => useCommandPalette({ hotkey: null }));
     act(() => result.current.show());
@@ -348,9 +355,7 @@ describe('useCommandPalette', () => {
   });
 
   it('respects defaultOpen', () => {
-    const { result } = renderHook(() =>
-      useCommandPalette({ defaultOpen: true, hotkey: null }),
-    );
+    const { result } = renderHook(() => useCommandPalette({ defaultOpen: true, hotkey: null }));
     expect(result.current.open).toBe(true);
   });
 });
diff --git a/packages/command-palette/src/useCommandPalette.ts b/packages/command-palette/src/useCommandPalette.ts
index f739287a..93fc78c5 100644
--- a/packages/command-palette/src/useCommandPalette.ts
+++ b/packages/command-palette/src/useCommandPalette.ts
@@ -32,10 +32,9 @@ export interface UseCommandPaletteHelpers {
  * inputs unless the user explicitly holds the modifier.
  */
 export function useCommandPalette(
-  options: UseCommandPaletteOptions = {},
+  options: UseCommandPaletteOptions = {}
 ): UseCommandPaletteHelpers {
-  const { hotkey = { key: 'k', meta: true, ctrl: true }, defaultOpen = false } =
-    options;
+  const { hotkey = { key: 'k', meta: true, ctrl: true }, defaultOpen = false } = options;
 
   const [open, setOpen] = useState(defaultOpen);
   const show = useCallback(() => setOpen(true), []);
@@ -45,6 +44,9 @@ export function useCommandPalette(
   useEffect(() => {
     if (!hotkey) return;
     const handler = (e: KeyboardEvent) => {
+      // Some keydown events (autofill, IME/composition, certain extensions) arrive
+      // with an undefined `key`; guard so we never crash on `.toLowerCase()`.
+      if (!e.key || !hotkey.key) return;
       if (e.key.toLowerCase() !== hotkey.key.toLowerCase()) return;
       const wantMeta = hotkey.meta ?? false;
       const wantCtrl = hotkey.ctrl ?? false;