diff --git a/src/modules/catalog/catalog.service.ts b/src/modules/catalog/catalog.service.ts
index 9d99f7d..39090b1 100644
--- a/src/modules/catalog/catalog.service.ts
+++ b/src/modules/catalog/catalog.service.ts
@@ -240,10 +240,10 @@ class CatalogService implements OnModuleInit {
   ) {
     this.logger.info('CatalogService - searchDataAssets');
 
-
     const { search, page, size, sort_by, order, ...filters } = query;
-
-    if (filters.owner) {
+    
+    // Verificar se filters.owner existe
+    if (filters.owner !== undefined && filters.owner !== null) {
       const { users: customer_users } =
         await this.userService.findAllUsersByCustomerId(customer_id);
 
@@ -253,7 +253,11 @@ class CatalogService implements OnModuleInit {
             ? filters.owner.split(',').map((o: string) => o.trim()) 
             : [filters.owner]);
 
-      const ownerIds = ownerValues
+      // Separar "sem owner" (marcador especial __null__) dos owners normais
+      const hasEmptyOwner = ownerValues.some(v => v === '__null__');
+      const normalOwners = ownerValues.filter(v => v !== '__null__');
+
+      const ownerIds = normalOwners
         .map((ownerValue: string) => {
           const user = customer_users.find(u => 
             u.name === ownerValue || u.email === ownerValue || u.id === ownerValue
@@ -262,13 +266,12 @@ class CatalogService implements OnModuleInit {
         })
         .filter((id: string) => id);
 
-      filters.owner = ownerIds;
-      
-      this.logger.info('Converted owner names to IDs:', { 
-        original: ownerValues, 
-        converted: ownerIds 
-      });
-    }
+      // Se tiver "sem owner", adicionar marcador especial
+      if (hasEmptyOwner) {
+        ownerIds.push('__null__');
+      }
+
+      filters.owner = ownerIds.length > 0 ? ownerIds : undefined;
 
     const { data_assets, total } = await lastValueFrom(
       this.catalogReadService.GetAllDataAssets(