[ArgumentNullException: Value cannot be null.
Parameter name: source]
System.Linq.Enumerable.Select(IEnumerable`1 source, Func`2 selector) +717
Sitecore.XA.Feature.Media.Repositories.GalleryRepository.GetModel() +157
Sitecore.XA.Foundation.Mvc.Controllers.StandardController.Index() +180
lambda_method(Closure , ControllerBase , Object[] ) +90
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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