check to make sure icon isn't undefined

apps/remix-ide/src/app/components/vertical-icons.tsx

@@ -73,7 +73,7 @@ export class VerticalIcons extends Plugin {
       Object.keys(this.icons).map((o) => {
         this.icons[o].active = false
       })
-      this.icons[name].active = true
+      this.icons[name] ? this.icons[name].active = true : null
       this.renderComponent()
     })
   }