diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverReportSignedPage.razor b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverReportSignedPage.razor
index 65e1a3a2..7ab5aca2 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverReportSignedPage.razor
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverReportSignedPage.razor
@@ -120,6 +120,18 @@
             _sig = cached;
         }
 
+        // Cache miss or missing sid — redirect back to report page
+        if (_sig is null)
+        {
+            Logger.LogWarning(
+                "[SignedPage] Cache miss or no sid={Sid} for {EnvelopeKey}, redirecting to report page.",
+                Sid, EnvelopeKey);
+            Navigation.NavigateTo(
+                $"/envelope/{Uri.EscapeDataString(EnvelopeKey)}/report",
+                forceLoad: true);
+            return;
+        }
+
         try
         {
             var pdfBytes = await PageDataService.GetDocumentAsync(_receiverUser);