diff --git a/public/assets/model/config.js b/public/assets/model/config.js
index 6bce78f3..a5819524 100644
--- a/public/assets/model/config.js
+++ b/public/assets/model/config.js
@@ -23,7 +23,7 @@ export function get(key, defaultValue) {
 }
 
 export function getVersion() {
-    return get("version", "");
+    return get("version", "na");
 }
 
 export function query() {
diff --git a/public/assets/pages/viewerpage/application_video.js b/public/assets/pages/viewerpage/application_video.js
index c41a741b..3936d702 100644
--- a/public/assets/pages/viewerpage/application_video.js
+++ b/public/assets/pages/viewerpage/application_video.js
@@ -1,4 +1,4 @@
-import { createElement } from "../../lib/skeleton/index.js";
+import { createElement, onDestroy } from "../../lib/skeleton/index.js";
 import rxjs, { effect } from "../../lib/rx.js";
 import { animate, slideYIn } from "../../lib/animate.js";
 import { loadCSS, loadJS } from "../../helpers/loader.js";
@@ -176,6 +176,10 @@ export default function(render, { mime, getFilename, getDownloadUrl }) {
                 hls.loadSource(sources[i].src);
             }
             hls.attachMedia($video);
+            onDestroy(() => {
+                $video.pause();
+                $video.remove();
+            });
             return sources;
         }),
         rxjs.mergeMap((sources) => rxjs.merge(
diff --git a/public/assets/pages/viewerpage/component_menubar.js b/public/assets/pages/viewerpage/component_menubar.js
index d3f93f2e..fec271bb 100644
--- a/public/assets/pages/viewerpage/component_menubar.js
+++ b/public/assets/pages/viewerpage/component_menubar.js
@@ -81,7 +81,7 @@ export function buttonDownload(name, link) {
 }
 
 export function buttonFullscreen($screen, fullscreen = null) {
-    let fullscreenHandler = null;
+    let fullscreenHandler = fullscreen;
     if (fullscreen === null) {
         if ("webkitRequestFullscreen" in document.body) {
             fullscreenHandler = () => $screen.webkitRequestFullscreen();
@@ -89,7 +89,7 @@ export function buttonFullscreen($screen, fullscreen = null) {
             fullscreenHandler = () => $screen.mozRequestFullScreen();
         }
     }
-    if (!fullscreenHandler) return;
+    if (!fullscreenHandler) return document.createDocumentFragment();
     const $el = createElement(`
         <span>
             <img class="component_icon" draggable="false" src="data:image/svg+xml;base64,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" alt="fullscreen">