ProjectionException throws when executing an EPiServer Find query

I do have following model in my project

public class DocModel
{
	[Id]
	public int Id { get; set; }
	public string DocName { get; set; }
	public double Rating { get; set; }
}

And, in the Find index, there is a object corresponding to above model

{"Id$$number": 719,"DocName$$string": "My Doc","Rating$$number": 0
}

But, when I try to execute following query

var docs = SearchClient.Instance.Search<DocModel>()
	.Filter(x => x.Id.Match(719))
	.Select(x => new { DocRating = x.Rating}).GetResult();

It will end-up with an exception

EPiServer.Find.ProjectionException was unhandled
  HResult=-2146232832
  Message=An exception of type ArgumentException was thrown while projecting field Rating$$number.
  Source=EPiServer.Find
  StackTrace:
       at EPiServer.Find.ProjectionHelper.ReplaceExpressionWithConstantFromField(Dictionary`2 args, Expression expression)
       at EPiServer.Find.ProjectionHelper.<>c__DisplayClass35.<ReplaceMemberAssignmentsWithFieldValues>b__34(Expression expression)
       at EPiServer.Find.Helpers.Linq.ExpressionReplacer`1.Visit(Expression expression)
       at EPiServer.Find.Helpers.Linq.ExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
       at EPiServer.Find.Helpers.Linq.ExpressionVisitor.VisitNew(NewExpression nex)
       at EPiServer.Find.Helpers.Linq.ExpressionVisitor.Visit(Expression exp)
       at EPiServer.Find.Helpers.Linq.ExpressionReplacer`1.Visit(Expression expression)
       at EPiServer.Find.Helpers.Linq.ExpressionReplacer`1.Replace(Expression expression, Func`2 predicate, Func`2 replaceWith)
       at EPiServer.Find.Helpers.Linq.ExpressionExtensions.Replace[TExpression](Expression expression, Func`2 predicate, Func`2 replaceWith)
       at EPiServer.Find.ProjectionHelper.ReplaceMemberAssignmentsWithFieldValues(Expression selector, Dictionary`2 args)
       at EPiServer.Find.ProjectionHelper.GetMappedSearchResultItem[TResult](SearchRequestBody requestBody, SearchHit`1 searchHit)
       at EPiServer.Find.ProjectionHelper.GetMappedResult[TResult](SearchRequestBody requestBody, SearchResults`1 jsonResult)
       at EPiServer.Find.SearchExtensions.GetProjectedResult[TResult](ISearch`1 search, SearchContext context)
       at EPiServer.Find.SearchExtensions.GetResult[TResult](ISearch`1 search)
       at FindTestApp.Program.Main(String[] args) in e:\FindTestApp\FindTestApp\FindTestApp\Program.cs:line 43
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.ArgumentException
       HResult=-2147024809
       Message=Argument types do not match
       Source=System.Core
       StackTrace:
            at System.Linq.Expressions.Expression.Constant(Object value, Type type)
            at EPiServer.Find.ProjectionHelper.ReplaceExpressionWithConstantFromField(Dictionary`2 args, Expression expression)
       InnerException: 

So, what is wrong with my query and how do I fix it ?