Call to FirstOrDefault(Func<T, bool> predicate) when the predicate matches no result raises NullReferenceException.

[sflanker]

See test case:

Invio.QueryProvider.MySql/test/Invio.QueryProvider.MySql.Test/MySqlQueryableTest.cs

Lines 91 to 93 in 03146ab

	[Fact(Skip = "BUG: FirstOrDefault generates NullReferenceException when there are no results.")]
	public override void FirstOrDefault_NoResults() {
	}

Expected behavior: FirstOrDefault should return default(T)

It is unknown whether this issue is specific to the FirstOrDefault overload that takes a predicate, or would also occur when calling .Where(predicate).FirstOrDefault().