chore: return early on invalid cookie

examples/nextjs-mcp/next-env.d.ts

@@ -0,0 +1,5 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

packages/better-auth/src/api/routes/session.ts

@@ -117,6 +117,7 @@ export const getSession = <Option extends BetterAuthOptions>() =>
 						ctx.setCookie(dataCookie, "", {
 							maxAge: 0,
 						});
+						return ctx.json(null);
 					}
 				}