DNN 6.00.01 / SmithCart 4.67

I'm a noob with the SmithCart so please bear with me if my problem is too obvious but I've been looking for answers and trying to fix it for days nonstop now - I'm very frustrated.

The issue I'm having is that I get the error "Critical error has occured - Object reference not set to an instance of an object." at different steps of the checkout. It could happen:

• after I click "Proceed to Checkout"
• after I enter my shipping info
• after I enter my billing info
• after I "Submit Order"
• after I "Continue" after submitting the order

My cart then says there's no item, but after 1 or multiple refreshes, the items reappear.

I notice more cases where items in the cart disappear, but I'm hoping it's all related to the same cause.

I use manual payment gateway, Purchase Order as the only option, no tax, free shipping, free handling, and no discounts. I've done 2 fresh installs. I have 1 BuyNow page and 1 ProductDetail page, I'm using the MiniCart on both pages. I have only 1 product so I can test better.

I get the bug sometimes (~25%) when going from Add to Cart to end of the checkout process which makes it more frustrating than if it were to happen all the time. Is there a Cart Setting I need to change? Something in the Store Admin I need to add? A Host setting? A cache setting? Please help!!!

Thanks for the response Kevin! Here is screenshot of my current cart settings. I've done a lot of playing around with it. I'm sorry I can't provide a specific steps where it would occur 100% of the time. Let me know if I could provide anything else that could help. Thanks again!

Also:

 

InnerException: Object reference not set to an instance of an object.

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: Smith.DNN.Modules.BuyNow.Cart.Checkout

StackTrace:

Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at Smith.DNN.Modules.BuyNow.Cart.Checkout() at Smith.DNN.Modules.BuyNow.Cart.btnMakePayment_Click(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

and:

 

InnerException: Object reference not set to an instance of an object.

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: Smith.DNN.Modules.BuyNow.Step1.GetTotalAfterTax

StackTrace:

Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at Smith.DNN.Modules.BuyNow.Step1.GetTotalAfterTax(Boolean useStep1DDTax) at Smith.DNN.Modules.BuyNow.Step1.ibNext_Click(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

 

The bug always and only occurs on a postback (any postback - Add To Cart, View Cart, Checkout, Next... etc.) Then the BuyNow page where I see the error message, I would see the mini-cart has 0 items :. it must be how SmithCart pulls the Cart data and the way my DNN/SmithCart is configured that is causing the Cart to lose its items in the code. Any insight?

I installed the same version of DNN (6.1.1) and SmithCart (4.67) on my localhost and applied the same setting as on my server's version and I was UNABLE to replicate the error.

I notice that the cart empties after 1 minute... simply by refreshing the BuyNow page I see it empty. If I were in the middle of the checkout process, I would receive a null reference exception. What configuration causes this?

I am using WinHost

I have changed all those attributes of httpRuntime in web.config but I still get the same error.

Hi Tiffany,

The behavior you have described above is not typical behavior of SmithCart, there must be something in your environment possibly your server, hosting, IIS, App Pool corruption possibly causing your session to timeout . The following link may help you solve this issue: http://c2itconsulting.blogspot.com/20....

The cause of issue cannot be easily determined and I would recommend having an expert look into this. If you do not have the resources in-house, we are of course available to research and troubleshoot the issue for you. If you would like to hire us, please review our support options here: http://www.smith-consulting.com/Forum...

Thanks,

Hi Tiffany,

Great news, thanks for posting back with an update in case other experience the same issue.

Thanks,