diff --git a/extension/src/service-worker/router/popup-only.ts b/extension/src/service-worker/router/popup-only.ts
index a069d01..bbc6036 100644
--- a/extension/src/service-worker/router/popup-only.ts
+++ b/extension/src/service-worker/router/popup-only.ts
@@ -59,6 +59,9 @@ export async function handle(
     case 'lock':
       session.clearCurrent();
       state.manifest = null;
+      // Don't leak the cached git-host (incl. lastSyncAt) across a lock —
+      // symmetric with the session-expiry path (index.ts); unlock rebuilds it.
+      state.gitHost = null;
       return { ok: true };
 
     case 'list_items': {