fix

app/Http/Validators/SupplierValidator.php

@@ -67,7 +67,7 @@ class SupplierValidator
         if (empty($request->get('supplier_id'))) {
             $count = $supplierModel->where('supplier_name', $request->get('supplier_name'))->count();
             $companyNameCount = $supplierModel->where('register_company_name',
-                $request->get('register_company_name'))->count();
+                $request->get('register_company_name'))->where('register_company_name','!=','')->count();
         } else {
             $count = $supplierModel->where('supplier_name', $request->get('supplier_name'))
                 ->where('supplier_id', '!=', $request->get('supplier_id'))->count();