diff --git a/apps/mana/apps/web/src/routes/offline/+page.ts b/apps/mana/apps/web/src/routes/offline/+page.ts
index 189f71e2e..1b7861cd8 100644
--- a/apps/mana/apps/web/src/routes/offline/+page.ts
+++ b/apps/mana/apps/web/src/routes/offline/+page.ts
@@ -1 +1,10 @@
-export const prerender = true;
+// FIXME: prerender is disabled because the SvelteKit prerender worker
+// throws "Error: 500 /offline" with no usable stack trace during the
+// production build. Suspected cause: a module-level side-effect on the
+// shared layout (vault-client? data-layer-listeners?) that fails when
+// no `window` is available. SSR'ing the offline page at request time
+// is harmless — it's a static "you're offline" message — but the real
+// fix is to find which import throws on the bare server and guard it.
+//
+// First observed: 2026-04-07 during Memoro recording pipeline deploy.
+export const prerender = false;