diff --git a/ivette/src/renderer/ASTview.tsx b/ivette/src/renderer/ASTview.tsx
index b383770585a19e2eef98f8beba4d58850cf84a03..5feaaabcf144972804b0ba1ee573fc920deb40b7 100644
--- a/ivette/src/renderer/ASTview.tsx
+++ b/ivette/src/renderer/ASTview.tsx
@@ -121,7 +121,7 @@ const ASTview = () => {
   }
 
   // Theme Popup
-  const selectTheme = (id: string) => setTheme(id);
+  const selectTheme = (id?: string) => id && setTheme(id);
   const checkTheme =
     (th: { id: string }) => ({ checked: th.id === theme, ...th });
   const themePopup =