diff --git a/apps/docs/openapi/viewer.json b/apps/docs/openapi/viewer.json
index 2e089a7cf..881e3d8c8 100644
--- a/apps/docs/openapi/viewer.json
+++ b/apps/docs/openapi/viewer.json
@@ -1539,7 +1539,6 @@
                   },
                   "required": [
                     "sessionId",
-                    "resultId",
                     "typebot",
                     "messages"
                   ]
diff --git a/apps/viewer/src/features/chat/api/startChat.ts b/apps/viewer/src/features/chat/api/startChat.ts
index 065631a75..956148b0c 100644
--- a/apps/viewer/src/features/chat/api/startChat.ts
+++ b/apps/viewer/src/features/chat/api/startChat.ts
@@ -74,7 +74,7 @@ export const startChat = publicProcedure
         },
         messages,
         input,
-        resultId: resultId as string,
+        resultId,
         dynamicTheme,
         logs,
         clientSideActions,
diff --git a/packages/schemas/features/chat/schema.ts b/packages/schemas/features/chat/schema.ts
index a54d0dbfe..9d5147efe 100644
--- a/packages/schemas/features/chat/schema.ts
+++ b/packages/schemas/features/chat/schema.ts
@@ -317,7 +317,7 @@ export const startChatResponseSchema = z
     sessionId: z
       .string()
       .describe('To save and use for /continueChat requests.'),
-    resultId: z.string(),
+    resultId: z.string().optional(),
     typebot: z.object({
       id: z.string(),
       theme: themeSchema,