From 76c282c2cbb1b8a1f936f35da5c2f3345c633b51 Mon Sep 17 00:00:00 2001
From: Max Nuding <max.nuding@icloud.com>
Date: Sun, 20 Jul 2025 11:39:44 +0200
Subject: [PATCH] do not cache empty thumbnail lists

---
 src/lib/server/db.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/lib/server/db.ts b/src/lib/server/db.ts
index 933149e..c2a140d 100644
--- a/src/lib/server/db.ts
+++ b/src/lib/server/db.ts
@@ -1037,6 +1037,12 @@ function getCachedThumbnail(thumbnailUrl: string): SongThumbnailImage[] | null {
 }
 
 function cacheThumbnail(thumbnailUrl: string, thumbnails: SongThumbnailImage[]) {
+  if (!thumbnails) {
+    // This usually means, that the data is being saved to cached,
+    // while the thumbnail generation is not finished yet
+    logger.debug('will not cache empty thumbnail list', thumbnailUrl);
+    return;
+  }
   const now = new Date().getTime();
   const initialSize = thumbnailCache.size;
   if (initialSize >= maxThumbnailCacheSize) {