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Null Exception c#

I had following block of code that I got error out and don't know how to handle the null exception.

            internal static ApplicationCustomField GetFieldByLabel(this IEnumerable<ApplicationCustomField> fields, string label, bool caseSensitive = false)
            //Created a string to compare
                  var stringcomparison = caseSensitive ? StringComparison.CurrentCulture : StringComparison.InvariantCultureIgnoreCase;

                  var query = fields.Where(acf => acf.Label.Equals(label, stringcomparison));

            switch (query.Count())
                case 0: return null;
                case 1: return query.First();
                default: throw new InvalidOperationException();


---- it error out on the case 0: return null;
.NET ProgrammingC#LINQ QuerySQL

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8/22/2022 - Mon