diff --git a/static/player/progress.ts b/static/player/progress.ts
index d582c5c..f111a6f 100644
--- a/static/player/progress.ts
+++ b/static/player/progress.ts
@@ -16,6 +16,8 @@ const sendBeacon = (payload: string) => {
   return true;
 };
 
+const hasSessionCookie = (): boolean => document.cookie.includes('session_id=');
+
 let saveProgressInFlight: Promise<void> | null = null;
 
 /**
@@ -28,7 +30,7 @@ export const saveProgress = async (): Promise<void> => {
   const request = (async (): Promise<void> => {
     if (state.transitionEpisode !== null || !state.malID || state.video.currentTime < 1) return;
     // progress is user-scoped; avoid spamming 401s for anonymous sessions
-    if (!document.cookie.includes('mal_session=')) return;
+    if (!hasSessionCookie()) return;
     const episode = Number.parseInt(state.currentEpisode, 10);
     if (!episode) return;
 
@@ -79,7 +81,7 @@ const scheduleProgressSave = (): void => {
 export const markEpisodeTransition = (episodeNumber: number): void => {
   if (!state.malID || !episodeNumber) return;
   // progress is user-scoped; avoid sending beacons for anonymous sessions
-  if (!document.cookie.includes('mal_session=')) return;
+  if (!hasSessionCookie()) return;
   if (state.progressSaveTimer !== undefined) {
     window.clearTimeout(state.progressSaveTimer);
     state.progressSaveTimer = undefined;
@@ -122,7 +124,7 @@ export const setupProgress = (): void => {
   // save on page close
   window.addEventListener('beforeunload', () => {
     if (state.transitionEpisode !== null || state.completionSent || !state.malID) return;
-    if (!document.cookie.includes('mal_session=')) return;
+    if (!hasSessionCookie()) return;
     const episode = Number.parseInt(state.currentEpisode, 10);
     if (!episode) return;
     sendBeacon(buildPayload(episode, displayTimeFromAbsolute(state.video.currentTime)));