[ArgumentNullException: Value cannot be null.
Parameter name: key]
System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument) +52
System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +14594060
Sitecore.Feature.Search.Builders.SearchBuilder.GetUrlFromQuery(String query, Nullable`1 page, String sort, Dictionary`2 filters) in D:\a\1\s\src\Feature\Search\Sitecore.Feature.Search\Builders\SearchBuilder.cs:460
Sitecore.Feature.Search.Builders.<GetSortModes>d__18.MoveNext() in D:\a\1\s\src\Feature\Search\Sitecore.Feature.Search\Builders\SearchBuilder.cs:230
System.Linq.Buffer`1..ctor(IEnumerable`1 source) +284
System.Linq.Enumerable.ToArray(IEnumerable`1 source) +90
Sitecore.Feature.Search.Builders.SearchBuilder.GetSearchResults(String query, Int32 page, String sort, String filter, String mode) in D:\a\1\s\src\Feature\Search\Sitecore.Feature.Search\Builders\SearchBuilder.cs:115
Sitecore.Feature.Search.Controllers.SearchController.HalfWidthSearchResults(SearchQueryModel search) in D:\a\1\s\src\Feature\Search\Sitecore.Feature.Search\Controllers\SearchController.cs:36
lambda_method(Closure , ControllerBase , Object[] ) +139
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
System.Web.Mvc.<>c__DisplayClass24_0.<InvokeActionMethodWithFilters>b__0() +80
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +466
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +466
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +524
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