diff --git a/src/app/features/project-editor/services/project-validator.service.ts b/src/app/features/project-editor/services/project-validator.service.ts
index 5f16b8c..725219a 100644
--- a/src/app/features/project-editor/services/project-validator.service.ts
+++ b/src/app/features/project-editor/services/project-validator.service.ts
@@ -41,7 +41,9 @@ export class ProjectValidator {
     if (!staticPages || Array.isArray(staticPages)) {
       return [];
     }
-    const slugs = Object.values(staticPages).map(page => page.slug);
+    const slugs = Object.values(staticPages).map(page =>
+      page.slug && page.slug.trim() ? page.slug : (page.route ?? '').replace(/^\//, ''),
+    );
     const hasDuplicates = slugs.some((slug, index) => slugs.indexOf(slug) !== index);
     return hasDuplicates ? [{ code: 'duplicate-slugs', message: 'builder.validationDuplicateSlugs' }] : [];
   }