diff --git a/static/thumbnails.js b/static/thumbnails.js
index 24a4bbc..0540225 100644
--- a/static/thumbnails.js
+++ b/static/thumbnails.js
@@ -249,7 +249,7 @@ document.querySelectorAll("[data-thumb]").forEach((entry) => {
   entry.style.backgroundSize = "cover";
 
   const child = entry.querySelector("img[data-thumb-img]");
-  if (child) {
+  if (child && !child.complete) {
     child.style.opacity = 0;
     child.style.transition = "opacity 0.3s ease";
     child.addEventListener("load", () => {