Fix

src/components/Header/Header.tsx

@@ -79,7 +79,7 @@ const Header: React.FC<HeaderProps> = () => {
                       <Menu.Button className="bg-white rounded-full flex text-sm focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-primary">
                         <span className="sr-only">Open user menu</span>
                         <span className="inline-flex items-center justify-center h-8 w-8 rounded-full bg-gray-500 overflow-hidden">
-                          <Gravatar email={currentUser.email || ''} size={32} rating="pg" protocol="https://" />
+                          <Gravatar email={currentUser?.email || undefined} size={32} rating="pg" protocol="https://" />
                         </span>
                       </Menu.Button>
                     </div>