diff --git a/vike/node/runtime/renderPage.ts b/vike/node/runtime/renderPage.ts
index 2cf1e0f9e07..5aa9069a25a 100644
--- a/vike/node/runtime/renderPage.ts
+++ b/vike/node/runtime/renderPage.ts
@@ -413,6 +413,7 @@ async function renderPageNominal(
     }
   }
   assert(hasProp(pageContext, '_pageId', 'string'))
+  assert(pageContext.errorWhileRendering === null)
 
   // Render
   const pageContextAfterRender = await renderPageAlreadyRouted(pageContext)