diff --git a/webapp/controller/MarketController.class.php b/webapp/controller/MarketController.class.php
index b9a5c040..0ffac7c9 100644
--- a/webapp/controller/MarketController.class.php
+++ b/webapp/controller/MarketController.class.php
@@ -878,7 +878,7 @@ class MarketController extends BaseController {
 
     public function sellMyNft() {
         
-        $account = getReqVal('account', '');
+        $account = strtolower(getReqVal('account', ''));
         $token = getReqVal('token', '');
         $nft_token = getReqVal('nft_token', '');
         $s_price = getReqVal('s_price', '');
@@ -918,7 +918,7 @@ class MarketController extends BaseController {
     }
 
     public function buyNft() {
-        $account = getReqVal('account', '');
+        $account = strtolower(getReqVal('account', ''));
         $token = getReqVal('token', '');
         $nft_token = getReqVal('nft_token', '');
         $payment_token_address = getReqVal('payment_token_address', '');