The workflow goes in suspended mode with following message:
RequestorId: e95e93d7-10f5-4623-0000-000000000000. Details: RequestorId: e95e93d7-10f5-4623-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException: HTTP 500 {"Transfer-Encoding":["chunked"],"X-SharePointHealthScore":["0"],"SPClientServiceRequestDuration":["58"],"SPRequestGuid":["e95e93d7-10f5-4623-b99f-5d5cee950954"],"request-id":["e95e93d7-10f5-4623-b99f-5d5cee950954"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1; RequireReadOnly"],"MicrosoftSharePointTeamServices":["15.0.0.4420"],"Cache-Control":["max-age=0, private"],"Date":["Wed, 22 May 2013 20:40:54 GMT"],"X-AspNet-Version":["4.0.30319"],"X-Powered-By":["ASP.NET"]} at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)