Object reference error when trying to open a query via a shortcut

Hello,

I'm having trouble with a couple of queries in Self Service.

If I add a query as a shortcut to a shortcut group, save it, recycle the app pools and then view it as an end user in Self Service, it works fine.

If I subsequently amend the query shortcut by (say) Hiding the Filter then save it, recycle the app pools and then view it as an end user - it comes up with the error shown below.

I can't get anything to appear in the log files to help further so I'm a bit peeved to say the least - is a 7.5 upgrade supposed to be easy???

There has been an unexpected error. Click Continue to return to the previous page.

Object reference not set to an instance of an object.

at Touchpaper.Web.Console.Components.QueryHelper.IsValidCondition(ConditionType conditionType, IAttributeType attributeType)
at Touchpaper.Web.Console.Components.QueryParameters.AreConditionsEquivalent(QueryParameters requestParameters)
at Touchpaper.Web.Console.Components.QueryParameters.IsEquivalent(QueryParameters requestParameters)
at Touchpaper.Web.Console.Controllers.QueryController.RequestMatchesShortcut(QueryParameters requestParameters, String url)
at Touchpaper.Web.Console.Controllers.QueryController.AuthoriseQuery(QueryParameters requestParameters)
at Touchpaper.Web.Console.Controllers.QueryController.List()
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.b__a()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.<>c__DisplayClassf.b__c()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.<>c__DisplayClassf.b__c()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.<>c__DisplayClassf.b__c()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.<>c__DisplayClassf.b__c()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)