diff --git a/frontend/dcViewer.js b/frontend/dcViewer.js
index 282eb22..4b56d2f 100644
--- a/frontend/dcViewer.js
+++ b/frontend/dcViewer.js
@@ -1,5 +1,5 @@
 const SDK_VERSION = "2.6.78"; // соответствует package.json
-const SDK_URL = "./lib/dc-camera-context.es.js?v=3";
+const SDK_URL = "./lib/dc-camera-context.es.js?v=4";
 
 import { createLogo } from "./src/ui/logo.js";
 import { applyToolbarVars } from "./src/ui/toolbar.js?v=3";
diff --git a/frontend/index.html b/frontend/index.html
index 610794f..a5291fd 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -697,6 +697,6 @@
   <input id="fileInput" class="hidden" type="file"
          accept=".xkt,.glb,.gltf,.bim,.las,.laz,.obj,.stl">
 
-  <script type="module" src="/dcViewer.js?v=59"></script>
+  <script type="module" src="/dcViewer.js?v=60"></script>
 </body>
 </html>
diff --git a/frontend/lib/dc-camera-context.es.js b/frontend/lib/dc-camera-context.es.js
index 5160c73..330da6b 100644
--- a/frontend/lib/dc-camera-context.es.js
+++ b/frontend/lib/dc-camera-context.es.js
@@ -126073,6 +126073,10 @@ function loadMTLs(modelNode, state, ok) {
     var basePath = state.basePath;
     var srcList = Object.keys(state.materialLibraries);
     var numToLoad = srcList.length;
+    if (numToLoad === 0) {
+        ok();
+        return;
+    }
     for (var i = 0, len = numToLoad; i < len; i++) {
         loadMTL(modelNode, basePath, basePath + srcList[i], function () {
             if (--numToLoad === 0) {