diff --git a/metadata.json b/metadata.json
index 56cf45c..a8487b8 100644
--- a/metadata.json
+++ b/metadata.json
@@ -4,5 +4,5 @@
   "url": "https://github.com/axxapy/gnome-ui-tune",
   "uuid": "gnome-ui-tune@itstime.tech",
   "settings-schema": "org.gnome.shell.extensions.gnome-ui-tune",
-  "shell-version": ["45"]
+  "shell-version": ["45", "46"]
 }
diff --git a/src/modScaleThumbnails.js b/src/modScaleThumbnails.js
index dfe110b..54875f0 100644
--- a/src/modScaleThumbnails.js
+++ b/src/modScaleThumbnails.js
@@ -23,7 +23,7 @@ export default class extends Mod {
         const __scaleFactor = this.scaleFactor
         this.bkp_SecondaryMonitorDisplay_getThumbnailsHeight = SecondaryMonitorDisplay.prototype._getThumbnailsHeight
         SecondaryMonitorDisplay.prototype._getThumbnailsHeight = function(box) {
-            if (!this._thumbnails.visible)
+            if (!this || !this._thumbnails.visible)
                 return 0;
             
             this._thumbnails._maxThumbnailScale = __scaleFactor