An unhandled exception occurred in Microsoft.Office.Project.Server.BusinessLayer.Statusing.StatusingReadStatusApprovalsForProjectForGridJson when one user access to Approval Center

Hi all,

One user receive an error when he access to "Approval Center":

An unhandled exception occurred in Microsoft.Office.Project.Server.BusinessLayer.Statusing.StatusingReadStatusApprovalsForProjectForGridJson

I have detected this error in Project Server Logs:

Exception occurred in method Microsoft.Office.Project.Server.BusinessLayer.Statusing.StatusingReadStatusApprovalsForProjectForGridJson 
System.ArgumentException: Object must be of type Double.     
at System.Double.CompareTo(Object value)     
at System.StringComparer.Compare(Object x, Object y)     
at Microsoft.Office.Project.Server.Utility.PJLocalStringComparer.Compare(Object x, Object y, Boolean strict)     
at Microsoft.SharePoint.JSGrid.GridField.Compare(Object left, Object right, Boolean strict)     
at Microsoft.SharePoint.JSGrid.GridSerializer.DataRowComparer`1.Compare(T x, T y)     
at System.Linq.EnumerableSorter`2.CompareKeys(Int32 index1, Int32 index2)     
at System.Linq.EnumerableSorter`1.QuickSort(Int32[] map, Int32 left, Int32 right)     
at System.Linq.EnumerableSorter`1.Sort(TEle.ment[] elements, Int32 count)     
at System.Linq.OrderedEnumerable`1.<GetEnumerator>d__0.MoveNext()     
at Microsoft.SharePoint.JSGrid.GridSerializer.GroupedSet..ctor(GridSerializer serializer, IEnumerable`1 unfilteredRows, IEnumerable`1 filteredRows)     
at Microsoft.SharePoint.JSGrid.GridSerializer.ExpandRows(IEnumerable`1 unfilteredRows, IEnumerable`1 filteredRows, Boolean onlyMakingAutoFilterEntries, HierarchySet& hierarchySet)     
at Microsoft.SharePoint.JSGrid.GridSerializer.BuildOutput()     
at Microsoft.SharePoint.JSGrid.GridSerializer.ToJson(Serializer s)     
at Microsoft.SharePoint.JsonUtilities.Serializer.SerializeToJson(Object o)     
at Microsoft.Office.Project.Server.BusinessLayer.Statusing.ReadStatusApprovalsForProjectForGridJson(JsGridSerializerArguments gridSerializerArgs, String fromDate, String toDate, Int32 durationFormat, Int32 workFormat)     
at Microsoft.Office.Project.Server.Wcf.Implementation.PWAImpl.StatusingReadStatusApprovalsForProjectForGridJson(JsGridSerializerArguments gridSerializerArgs, String fromDate, String toDate, Int32 durationFormat, Int32 workFormat)

I searched orphans projects (https://social.technet.microsoft.com/Forums/en-US/cbca6bac-6199-4707-b2e9-a88573793581/projec-server-2010-error-in-approval-center) and have found none.

Has anyone had the same issue?

Thank you in advance and best regards,

Rafael Baena