From e310d5e8ee249d7424876de8758b425c7161af62 Mon Sep 17 00:00:00 2001
From: Ashley Harrison <ashley.harrison@grafana.com>
Date: Mon, 5 Jan 2026 15:27:35 +0000
Subject: [PATCH] FS: Only attempt session rotation if expiration cookie exists
 (#115824)

don't attempt rotation if no expiration cookie exists
---
 pkg/services/frontend/index.html | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pkg/services/frontend/index.html b/pkg/services/frontend/index.html
index 198b8216189..777513358c1 100644
--- a/pkg/services/frontend/index.html
+++ b/pkg/services/frontend/index.html
@@ -250,11 +250,14 @@
             }
           }
 
-          return null;
+          return undefined;
         }
 
         function getSessionExpiration() {
-          const value = getCookie("grafana_session_expiry") || "0";
+          const value = getCookie("grafana_session_expiry");
+          if (!value) {
+            return undefined;
+          }
           const realExpiresSeconds = parseInt(value, 10);
           const expiresSeconds = Math.max(realExpiresSeconds - 10, 0); // Rotate 10s before the real expiration
           const expiration = new Date(expiresSeconds * 1000);
@@ -332,7 +335,7 @@
                 const now = new Date();
 
                 // If the session has expired, don't continue trying to fetch boot data
-                if (now >= sessionExpiration) {
+                if (sessionExpiration && now >= sessionExpiration) {
                   await rotateSession();
                 }
               } catch (error) {