diff --git a/javascript/gallery.js b/javascript/gallery.js
index c4f483b5e..ed17499c0 100644
--- a/javascript/gallery.js
+++ b/javascript/gallery.js
@@ -683,10 +683,12 @@ async function thumbCacheCleanup(folder, imgCount, controller) {
       const t0 = performance.now();
       const staticGalleryHashes = new Set(galleryHashes); // External context should be safe since this function run is guarded by AbortController/AbortSignal in the SimpleFunctionQueue
       const cachedHashesCount = await idbCount(folder)
-        .catch(() => Infinity); // Forces next check to fail if something went wrong
+        .catch((e) => {
+          error(`Thumbnail DB cleanup: Error when getting entry count for "${folder}".`, e);
+          return Infinity; // Forces next check to fail if something went wrong
+        });
       if (cachedHashesCount < staticGalleryHashes.size + 500) {
         // Don't run when there aren't many excess entries
-        debug('Thumbnail DB cleanup: Maintenance is not needed yet');
         return;
       }