Mine

Index: java/net/sf/l2j/gameserver/clientpackets/RequestPrivateStoreManageBuy.java
===================================================================
--- java/net/sf/l2j/gameserver/clientpackets/RequestPrivateStoreManageBuy.java	(revision 1240)
+++ java/net/sf/l2j/gameserver/clientpackets/RequestPrivateStoreManageBuy.java	(working copy)
@@ -56,7 +56,11 @@
             sendPacket(new ActionFailed());
             return;
         }
-        
+        if (player.getMountType() != 0)
+        {
+        	sendPacket(new ActionFailed());
+        	return;
+        }
         if (player.getPrivateStoreType() == L2PcInstance.STORE_PRIVATE_BUY || player.getPrivateStoreType() == L2PcInstance.STORE_PRIVATE_BUY +1)
         	player.setPrivateStoreType(L2PcInstance.STORE_PRIVATE_NONE);
 
Index: java/net/sf/l2j/gameserver/clientpackets/RequestPrivateStoreManageSell.java
===================================================================
--- java/net/sf/l2j/gameserver/clientpackets/RequestPrivateStoreManageSell.java	(revision 1240)
+++ java/net/sf/l2j/gameserver/clientpackets/RequestPrivateStoreManageSell.java	(working copy)
@@ -56,7 +56,11 @@
             sendPacket(new ActionFailed());
             return;
         }
-        
+        if (player.getMountType() != 0)
+        {
+        	sendPacket(new ActionFailed());
+        	return;
+        }
         if (player.getPrivateStoreType() == L2PcInstance.STORE_PRIVATE_SELL 
         		|| player.getPrivateStoreType() == L2PcInstance.STORE_PRIVATE_SELL + 1
         		|| player.getPrivateStoreType() == L2PcInstance.STORE_PRIVATE_PACKAGE_SELL)