Bug in this web site's code

Please fix a bug I saw when trying to post a reply here: Server Error in '/Forums/AspNetForums20' Application. -------------------------------------------------------------------------------- Cannot insert the value NULL into column 'PinnedDate', table 'V003U27DHH.dbo.Posts'; column does not allow nulls. INSERT fails. 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.Exception: Cannot insert the value NULL into column 'PinnedDate', table 'V003U27DHH.dbo.Posts'; column does not allow nulls. INSERT fails. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [Exception: Cannot insert the value NULL into column 'PinnedDate', table 'V003U27DHH.dbo.Posts'; column does not allow nulls. INSERT fails.] AspNetForums.Data.SqlDataProvider.AddPost(Post postToAdd, String username) AspNetForums.Posts.AddPost(Post postToAdd) AspNetForums.Controls.CreateEditPost.PostButton_Click(Object sender, EventArgs e) System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1277 -------------------------------------------------------------------------------- Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573