I entered a coupon and mistakenly entered -7.00 and now I can't get back in to change or fix it. Every time I click on coupon in the store admin module I get the following error: A critical error has occurred. Nullable object must have a value. It won't let me in to fix or change the coupon.

Here's the info:

AssemblyVersion: 5.6.7
PortalID: 0
PortalName: Cozy's Cuts For Kids
UserID: 2
UserName: admin
ActiveTabID: 71
ActiveTabName: Store Admin
RawURL: /HairCareProducts/StoreAdmin/tabid/71/v/Coupons/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: https://www.cozyscutsforkids.com/HairCareProducts/StoreAdmin.aspx
UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: e58bb33e-206b-40cf-82d5-3607db8afb99
InnerException: Nullable object must have a value.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.ThrowHelper.ThrowInvalidOperationException
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Nullable object must have a value. ---> System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at System.Nullable`1.get_Value() at ASP.desktopmodules_dnnspot_store_modules_admin_coupons_ascx.__DataBind__control4(Object sender, EventArgs e) at System.Web.UI.Control.OnDataBinding(EventArgs e) at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at System.Web.UI.Control.DataBindChildren() at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) at System.Web.UI.WebControls.Repeater.DataBind() at DNNspot.Store.Modules.Admin.Coupons.LoadCoupons() at DNNspot.Store.Modules.Admin.Coupons.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: GENERIC77