1 files changed, 1 insertions, 1 deletions

diff --git a/subprojects/frontend/src/xtext/BackendConfig.ts b/subprojects/frontend/src/xtext/BackendConfig.ts
index 4c7eac5f..e7043bd5 100644
--- a/subprojects/frontend/src/xtext/BackendConfig.ts
+++ b/subprojects/frontend/src/xtext/BackendConfig.ts
@@ -11,7 +11,7 @@ import { z } from 'zod';
 export const ENDPOINT = 'config.json';
 
 const BackendConfig = z.object({
-  webSocketURL: z.string().url(),
+  webSocketURL: z.string().url().optional(),
 });
 
 type BackendConfig = z.infer<typeof BackendConfig>;