diff --git a/src/product/product.controller.ts b/src/product/product.controller.ts
index 0539d81..f26f7e0 100644
--- a/src/product/product.controller.ts
+++ b/src/product/product.controller.ts
@@ -77,8 +77,8 @@ export class ProductController {
   ) {
     const data = await this.productService.findAll(
       page,
-      JSON.parse(supplier),
-      JSON.parse(subcategory),
+      supplier == 'null' ? null : supplier,
+      subcategory == 'null' ? null : subcategory,
     );
 
     return {
@@ -161,7 +161,7 @@ export class ProductController {
   ) {
     const data = await this.productSubCategoriesService.findAll(
       page,
-      JSON.parse(category),
+      category == 'null' ? null : category,
     );
 
     return {