diff --git a/src/composables/Designer.js b/src/composables/Designer.js
index 160484c..747784b 100644
--- a/src/composables/Designer.js
+++ b/src/composables/Designer.js
@@ -59,7 +59,9 @@ class Designer {
   }
   #updateStyle(selectedCSS, CSSArray, mutationName) {
     const currentCSS = CSSArray.find((CSS) => {
-      return this.getElement.value.classList.contains(CSS);
+      if (this.getElement.value !== null) {
+        return this.getElement.value.classList.contains(CSS);
+      }
     });
 
     // set to 'none' if undefined