Data Controls :: User To User Profile View Showing Error

 When a user wants to view another user profile on user profile page this error will show up

 ERROR

Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:
Line 72: protected void OnDataBound(object sender, EventArgs e)
Line 73: {
Line 74: string userName = (FormView1follow.Row.Cells[0].FindControl("hfUserName") as HiddenField).Value;
Line 75: string friendsUserName = (FormView1follow.Row.Cells[0].FindControl("hfFriendsUserName") as HiddenField).Value;
Line 76: string followStatus = (FormView1follow.Row.Cells[0].FindControl("hfFollowStatus") as HiddenField).Value;

 HTML

<div class="text-center">
<asp:FormView ID="FormView1follow" runat="server" OnDataBound="OnDataBound" Width="100%">
<ItemTemplate>
<asp:HiddenField ID="hfUserName" runat="server" Value='<%# Eval("UserName") %>' />
<asp:HiddenField ID="hfFriendsUserName" runat="server" Value='<%# Eval("FriendUserName") %>' />

[Code] .....