diff --git a/src/space-model/services/space-model.service.ts b/src/space-model/services/space-model.service.ts
index cdc0ec6..22b7aef 100644
--- a/src/space-model/services/space-model.service.ts
+++ b/src/space-model/services/space-model.service.ts
@@ -224,7 +224,7 @@ export class SpaceModelService {
         );
       }
 
-      if (dto.subspaceModels) {
+      if (dto.subspaceModels?.length > 0) {
         modifiedSubspaces =
           await this.subSpaceModelService.modifySubspaceModels(
             dto.subspaceModels,
@@ -235,7 +235,7 @@ export class SpaceModelService {
           );
       }
 
-      if (dto.tags) {
+      if (dto.tags?.length) {
         modifiedProductAllocations =
           await this.spaceModelProductAllocationService.updateProductAllocations(
             dto.tags,