Description

In Sitecore Forms, submitting a form might fail with the following unhandled exception when the IsAjax check box is unchecked on the related form item:

Exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Source: Sitecore.ExperienceForms.Mvc
at Sitecore.ExperienceForms.Mvc.Controllers.BaseFormBuilderController.ProcessFormData(FormDataModel data)
at Sitecore.ExperienceForms.Mvc.Controllers.FormBuilderController.Index(FormDataModel data)
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass24_0.<InvokeActionMethodWithFilters>b__0()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

Solution

To resolve the issue, consider one of the following options:

• Upgrade Sitecore XP instance to Sitecore XP 10.0.0 or later.
• For Sitecore XP 9.3, download and install the corresponding cumulative hotfix available in KB1001332.
• For Sitecore XP 9.2, download and install the corresponding cumulative hotfix available in KB1001331.