An unhandled exception might be thrown when the server restarts after site deployment or during scaling out. The issue occurs only for the first request to the application after a restart. The second and all subsequent requests to application are processed as expected. The issue does not have any significant impact on scaling and site visitors. The following error message might appear:
[InvalidOperationException: Illegal recursion detected: GetModel]
Sitecore.Mvc.Common.RecursionPreventer..ctor(String title, Flag flag) +173
Sitecore.Mvc.Presentation.Rendering.GetModel() +73
Sitecore.Mvc.Presentation.Rendering.get_Model() +31
Sitecore.XA.Foundation.Mvc.Wrappers.Rendering.get_Item() +35
Sitecore.XA.Feature.SiteMetadata.Repositories.MetadataBaseRepository`1.GetMetatag(String property, ID fieldId) +33
Sitecore.XA.Feature.SiteMetadata.Repositories.MetadataBaseRepository`1.<BuildModelMapping>b__4_0(KeyValuePair`2 id) +24
System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +302
System.Linq.WhereEnumerableIterator`1.MoveNext() +124
System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +436
System.Linq.Enumerable.ToList(IEnumerable`1 source) +69
Sitecore.XA.Feature.SiteMetadata.Repositories.TwitterMetadata.TwitterMetadataRepository.GetMetaTags() +36
Sitecore.XA.Feature.SiteMetadata.Repositories.MetadataBaseRepository`1.GetModel() +73
Sitecore.XA.Feature.SiteMetadata.Controllers.TwitterMetadataController.GetModel() +26
Sitecore.XA.Feature.SiteMetadata.Controllers.MetadataController.Index() +22
lambda_method(Closure , ControllerBase , Object[] ) +90
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +229
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +80
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +452
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +452
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +530
This issue affects SXA 1.6.0 - 1.8.1 versions.
To resolve the issue, download and install the appropriate patch available on this page:
https://github.com/SitecoreSupport/Sitecore.Support.247244/releases
To get a solution for other SXA releases, contact Sitecore Support.