Following code fails with ArgumentNullException:

var participants = new[]

;
var builder = new MongoDB.Driver.Builders.UpdateBuilder<Domain.Match>();
var mongoQuery = builder.Pull(m => m.ParticipantNumbers, query => query.Where(p => participants.Contains(p))); //This line fails with the exception

Stack trace:
System.ArgumentNullException: Value cannot be null.
Parameter name: name
at MongoDB.Driver.Builders.Query.In(String name, IEnumerable`1 values)
at MongoDB.Driver.Linq.PredicateTranslator.BuildMethodCallQuery(MethodCallExpression methodCallExpression)
at MongoDB.Driver.Linq.PredicateTranslator.BuildQuery(Expression expression)
at Test.TestClass.<>c_DisplayClass4.<TestMethod>b_3(QueryBuilder`1 query) in c:\dev\TestClass.cs:line 44
at MongoDB.Driver.Builders.UpdateBuilder`1.Pull[TValue](Expression`1 memberExpression, Func`2 elementQueryBuilderFunction)
. . .

My guesses:
It fails when calling query.Where() with lambda expression having no property access: p => participants.Contains(p). (p is a scalar value and used directly by its value). If I change the lambda to some complex object that has a property then it works: query.Where(complexObject => participants.Contains(complexObject.ParticipantNumber)). It seems that the query translator is able to translate expressions with properties only.