diff --git a/packages/builder/src/components/design/AppPreview/ComponentSelectionList.svelte b/packages/builder/src/components/design/AppPreview/ComponentSelectionList.svelte
index caf68e40ea..0d4f4ffe9c 100644
--- a/packages/builder/src/components/design/AppPreview/ComponentSelectionList.svelte
+++ b/packages/builder/src/components/design/AppPreview/ComponentSelectionList.svelte
@@ -7,7 +7,7 @@
 
   const isChildAllowed = ({ name }, selectedComponent) => {
     const currentComponent = store.actions.components.getDefinition(
-      selectedComponent._component
+      selectedComponent?._component
     )
 
     return currentComponent?.illegalChildren?.includes(name)