diff --git a/src/browser/routes/agent.shared.ts b/src/browser/routes/agent.shared.ts
index 33b15d23b45..4f4592c87a1 100644
--- a/src/browser/routes/agent.shared.ts
+++ b/src/browser/routes/agent.shared.ts
@@ -191,10 +191,6 @@ export async function withRouteTabContext<T>(
 
     return result;
   } catch (err) {
-    // Ensure res.json is always restored for error handling.
-    if (params.res.json !== originalJson) {
-      params.res.json = originalJson;
-    }
     handleRouteError(params.ctx, params.res, err);
     return undefined;
   }